@Book{		  Paun:DNA.Splicing.computing,
  author       = {Gheorghe P\u{a}un},
  title        = {Computability of the {DNA} and cells. Splicing and
                  membrane computing},
  publisher    = {SBEB Publishing},
  year         = {2008},
  address      = {Choundrant, Louisiana},
}

@Book{		  Frisco:Cells-Advances-in-Membrane-Computing,
  author       = {Pierluigi Frisco},
  title        = {Computing with Cells. Advances in Membrane Computing},
  publisher    = {Oxford University Press},
  year         = {2008},
}

@PhDThesis{	  Ionescu:Membrane-Computing-Traces,
  author       = {Mihai Ionescu},
  title        = {Membrane Computing. Traces, Neural Inspired Models
                  Controls},
  school       = {Universitat Rovira i Virgili},
  year         = {2008},
  address      = {Tarragona, Spain},
}

@PhDThesis{	  Brijder:Natural-Computation-Gene-Assembly.Systems,
  author       = {Robert Brijder},
  title        = {Models of Natural Computation: Gene Assembly and Membrane
                  Systems},
  school       = {Leiden University},
  year         = {2008},
  address      = {Netherlands},
}

@TechReport{	  Alhazov.ea:P-systems,
  author       = {Artiom Alhazov and Sergey Verlan},
  title        = {Minimization strategies for rule complexity of universal
                  antiport {P}~systems},
  institution  = {Turku Centre for Computer Science},
  year         = {2008},
  type         = {Technical Report},
  number       = {862},
}

@TechReport{	  Murphy.ea:NL-using-membrane-systems-without-charges.dissolution,
  author       = {Niall Murphy and Damien Woods},
  title        = {A characterisation of {NL} using membrane systems without
                  charges and dissolution},
  institution  = {Department of Computer Science, National University of
                  Ireland, Maynooth},
  year         = {2008},
  type         = {Technical Report},
  number       = {2008-01},
}

@article{Cazzaniga.etal:2008,
  author       = {Paolo Cazzaniga and Dario Pescini and Daniela Besozzi and
                  Giancarlo Mauri and Sonia Colombo and Enzo Martegani},
  title        = {Modeling and stochastic simulation of the Ras/cAMP/PKA pathway
                  in the yeast Saccharomyces cerevisiae evidences a key regulatory
                  function for intracellular guanine nucleotides pools},
  journal      = {Journal of Biotechnology},
  volume       = {133},
  number       = {3},
  year         = {2008},
  pages        = {377-385},
  bibdate      = {07/06/09},
}

@phdthesis{Liang:2007,
  author       = {Huang Liang},
  title        = {Research on Membrane Computing. Optimization Methods},
  school       = {Institute of Advanced Process Control, Zhejiang University},
  year         = {2007},
  address      = {China},
  bibdate      = {04/06/09},
}

@phdthesis{Romero-Campero:2008,
  author       = {Francisco J. Romero-Campero},
  title        = {{P}~systems, a computational modelling framework for systems
                  biology},
  school       = {Universidad de Sevilla},
  year         = {2008},
  address      = {Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Paun:2008c,
  author       = {Gheorghe P\u{a}un},
  title        = {An introduction to {MC}, after 10 years, by means of a
                  (partial) glossary},
  booktitle    = {Second International Meeting on Membrane Computing
                  and Biologically Inspired Process Calculi},
  editor       = {Gabriel Ciobanu},
  pages        = {1-9},
  year         = {2008},
  venue        = {Ia\c{s}i, Romania},
  bibdate      = {04/06/09},
}

@inproceedings{Pinna.etal:2008,
  author       = {G. Michele Pinna and Andrea Saba},
  title        = {An event based semantics of P systems},
  booktitle    = {Second International Meeting on Membrane Computing
                  and Biologically Inspired Process Calculi},
  editor       = {Gabriel Ciobanu},
  pages        = {174-187},
  year         = {2008},
  venue        = {Ia\c{s}i, Romania},
  bibdate      = {04/06/09},
}

@inproceedings{Mazza.etal:2008,
  author       = {Tommaso Mazza and Matteo Cavaliere},
  title        = {Cell cycle and tumor growth in membrane systems with
                  peripheral proteins},
  booktitle    = {Second International Meeting on Membrane Computing
                  and Biologically Inspired Process Calculi},
  editor       = {Gabriel Ciobanu},
  pages        = {145-158},
  year         = {2008},
  venue        = {Ia\c{s}i, Romania},
  bibdate      = {04/06/09},
}

@inproceedings{Barbuti.etal:2008e,
  author       = {Roberto Barbuti and Andrea Maggiolo-Schettini and Paolo
                  Milazzo and Luca Tesei},
  title        = {Timed {P}~automata},
  booktitle    = {Second International Meeting on Membrane Computing and
                  Biologically Inspired Process Calculi},
  editor       = {Gabriel Ciobanu},
  pages        = {53-67},
  year         = {2008},
  venue        = {Ia\c{s}i, Romania},
  bibdate      = {04/06/09},
}

@inproceedings{Ipate.etal:2008,
  author       = {Florentin Ipate and Marian Gheorghe},
  title        = {Testing non-deterministic stream {X}-machine models and
                  {P}~systems},
  booktitle    = {Second International Meeting on Membrane Computing and
                  Biologically Inspired Process Calculi},
  editor       = {Gabriel Ciobanu},
  pages        = {117-130},
  year         = {2008},
  venue        = {Ia\c{s}i, Romania},
  bibdate      = {04/06/09},
}

@inproceedings{Serbanuta.etal:2009,
  author       = {Traian Serbanuta and Gheorghe
                  Stefanescu and Grigore Rosu},
  title        = {Defining and Executing {P}~Systems with Structured
                  Data in~{K}},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {374-393},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  Series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Sempere:2009,
  author       = {Jos{\'e} M. Sempere},
  title        = {Translating Multiset Tree Automata into {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Pescini.etal:2009,
  author       = {Dario Pescini and Paolo Cazzaniga and Claudio Ferretti and
                  Giancarlo Mauri},
  title        = {First Steps Towards a Wet Implementation for $\tau$-{DPP}},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {355-373},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Nguyen.etal:2009,
  author       = {Van Nguyen and David Kearney and Gianpaolo Gioiosa},
  title        = {An Algorithm for Non-deterministic Object Distribution in
                  {P}~Systems and Its Implementation in Hardware},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {325-354},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Muskulus:2009,
  author       = {Michael Muskulus},
  title        = {Applications of Page Ranking in {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {311-324},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Manca.etal:2009,
  author       = {Vincenzo Manca and Roberto Pagliarini and Simone Zorzan},
  title        = {Toward an {MP} Model of Non-Photochemical Quenching},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {299-310},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Manca:2009,
  author       = {Vincenzo Manca},
  title        = {Enumerating Membrane Structures},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {292-298},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Leporati.etal:2009,
  author       = {Alberto Leporati and Claudio Zandron and Giancarlo Mauri},
  title        = {How Redundant Is Your Universal Computation Device?},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {274-291},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Kefalas.etal:2009,
  author       = {Petros Kefalas and Ioanna Stamatopoulou and George
                  Eleftherakis and Marian Gheorghe},
  title        = {Transforming State-Based Models to {P}~Systems Models in
                  Practice},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {260-273},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Jack.etal:2009,
  author       = {John Jack and Andrei P\u{a}un and Alfonso Rodr{\'i}guez-Pat{\'o}n},
  title        = {Effects of {HIV-1} Proteins on the {F}as-Mediated Apoptotic
                  Signaling Cascade: A Computational Study of Latent {CD4+},
                  {T}~Cell Activation},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {246-259},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Hinze.etal:2009,
  author       = {Thomas Hinze and Raffael Fassler and Thorsten Lenser and
                  Naoki Matsumaru and Peter Dittrich},
  title        = {Event-Driven Metamorphoses of {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {231-245},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Gutierrez-Naranjo.etal:2009,
  author       = {Miguel A. Guti{\'e}rrez-Naranjo and Mario
                  J. P{\'e}rez-Jim{\'e}nez},
  title        = {Hebbian Learning from Spiking Neural {P}~Systems View},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {217-230},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Gheorghe.etal:2009,
  author       = {Marian Gheorghe and Florentin Ipate},
  title        = {On Testing {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {204-216},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Diaz-Pernil.etal:2009,
  author       = {Daniel D{\'i}az-Pernil and Ignacio P{\'e}rez-Hurtado
                  and Mario J. P{\'e}rez-Jim{\'e}nez Agust{\'i}n
                  Riscos-N{\'u}{\~n}ez},
  title        = {A {P}-{L}ingua Programming Environment for Membrane
                  Computing},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {187-203},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Frutos.etal:2009,
  author       = {Juan Alberto Frutos and Fernando Arroyo and Alberto Arteta},
  title        = {Usefulness States in New {P}~System Communication
                  Architectures},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {169-186},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Castellini.etal:2009,
  author       = {Alberto Castellini and Vincenzo Manca},
  title        = {{M}eta{P}lab: A Computational Framework for Metabolic
                  {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {157-168},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Colomer.etal:2009,
  author       = {M{\'o}nica Cardona M. Angels Colomer and Mario
                  J. P{\'e}rez-Jim{\'e}nez and Delf{\'i} Sanuy and
                  Antoni Margalida},
  title        = {Modeling Ecosystems Using {P}~Systems: The Bearded Vulture, a
                  Case Study},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {137-156},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Beyreder.etal:2009,
  author       = {Markus Beyreder and Rudolf Freund},
  title        = {Membrane Systems Using Noncooperative Rules with
                  Unconditional Halting},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {129-136},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Alhazov.etal:2009b,
  author       = {Artiom Alhazov and Maurice Margenstern and Sergey Verlan},
  title        = {Fast Synchronization in {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {118-128},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Alhazov.etal:2009,
  author       = {Artiom Alhazov and Liudmila Burtseva and Svetlana Cojocaru
                  and Yurii Rogozhin},
  title        = {Solving {PP}-Complete and \#{P}-Complete Problems by
                  {P}~Systems with Active Membranes},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {108-117},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Agrigoroaiei.etal:2009,
  author       = {Oana Agrigoroaiei and Gabriel Ciobanu},
  title        = {Dual {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {95-107},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Abdulla.etal:2009,
  author       = {Parosh Aziz Abdulla and Giorgio Delzanno and Laurent Begin},
  title        = {On the Qualitative Analysis of Conformon {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {78-94},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Romero-Campero.etal:2009b,
  author       = {Francisco J. Romero-Campero and Jamie Twycross and Hongqing
                  Cao, Jonathan Blakes, Natalio Krasnogor},
  title        = {A Multiscale Modeling Framework Based on {P}~Systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {63-77},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Kirkilionis.etal:2009b,
  author       = {Markus Kirkilionis and Mirela Domijan and Martin Eigel and
                  Erwin George and Mike Li and Luca Sbano},
  title        = {A Definition of Cellular Interface Problems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {36-62},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Hogeweg:2009,
  author       = {Paulien Hogeweg},
  title        = {Multilevel Modeling of Morphogenesis},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {29-35},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Gilbert.etal:2009,
  author       = {David Gilbert and Rainer Breitling and Monika Heiner and
                  Robin Donaldson},
  title        = {An Introduction to BioModel Engineering, Illustrated for
                  Signal Transduction Pathways},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {13-28},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Danos.etal:2009,
  author       = {Vincent Danos and Jérôme Féret and Walter Fontana and Russell
                  Harmer and Jean Krivine},
  title        = {Investigation of a Biological Repair Scheme},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {1-12},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Gershoni.etal:2008,
  author       = {Renana Gershoni and Ehud Keinan and Gheorghe P\u{a}un and Ron
                  Piran and Tamar Ratner and Sivan Shoshani},
  title        = {Research topics arising from the (planned) {P}~systems
                  implementation experiment in {T}echnion},
  booktitle    = {Sixth Brainstorming Week on Membrane Computing},
  pages        = {183-192},
  year         = {2008},
  editor       = {Daniel D{\'i}az-Pernil and Carmen Graciani and Miguel Angel
                  Guti{\'e}rrez-Naranjo and Gheorghe P\u{a}un and Ignacio
                  P{\'e}rez-Hurtado and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
  venue        = {Sevilla, Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Frisco.etal:2008,
  author       = {Pierluigi Frisco and Gheorghe P\u{a}un},
  title        = {No cycles in compartments. Starting from conformon-{P},
                  systems},
  booktitle    = {Sixth Brainstorming Week on Membrane Computing},
  pages        = {157-179},
  year         = {2008},
  editor       = {Daniel D{\'i}az-Pernil and Carmen Graciani and Miguel Angel
                  Guti{\'e}rrez-Naranjo and Gheorghe P\u{a}un and Ignacio
                  P{\'e}rez-Hurtado and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
  venue        = {Sevilla, Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Paun.etal:2008,
  author       = {Gheorghe P\u{a}un and Francisco J. Romero-Campero},
  title        = {Membrane computing as a modeling framework. Cellular systems
                  case studies},
  booktitle    = {Formal Methods for Computational Systems Biology},
  pages        = {168-214},
  year         = {2008},
  editor       = {Marco Bernardo and Pierpaolo Degano and Gianluigi Zavattaro},
  volume       = {5016},
  series       = {Lecture Notes in Computer Science},
  venue        = {Bertinoro, Italy},
  bibdate      = {04/06/09},
}

@inproceedings{Stamatopoulou.etal:2008,
  author       = {Ioanna Stamatopoulou and Petros Kefalas and Marian Gheorghe},
  title        = {{OPERAS}: A Framework for the Formal Modelling of Multi-Agent
                  Systems and Its Application to Swarm-Based Systems},
  booktitle    = {Engineering Societies in the Agents World VIII: 8th
                  International Workshop},
  pages        = {158-174},
  year         = {2008},
  editor       = {Alexander Artikis and Gregory M. O'Hare and Kostas Stathis
                  and George Vouros},
  volume       = {4995},
  series       = {Lecture Notes In Artificial Intelligence},
  venue        = {Athens, Greece},
  bibdate      = {04/06/09},
}

@inproceedings{Romero-Campero.etal:2008c,
  author       = {Francisco J. Romero-Campero and Hongqing Cao and Miguel
                  Camara and Natalio Krasnogor},
  title        = {Structure and parameter estimation for cell systems biology
                  models},
  booktitle    = {Proceedings of the 10th annual conference on Genetic and
                  evolutionary computation},
  pages        = {331-338},
  year         = {2008},
  editor       = {Maarten Keijzer},
  venue        = {Atlanta, USA},
  bibdate      = {04/06/09},
}

@inproceedings{Romero-Campero.etal:2009,
  author       = {Francisco J. Romero-Campero and Jamie Twycross and Hongqing
                  Cao and Jonathan Blakes and Natalio Krasnogor},
  title        = {A multiscale modeling framework based on {P}~systems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {64-78},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Kirkilionis.etal:2009,
  author       = {Markus Kirkilionis and Mirela Domijan and Martin Eigel and
                  Erwin George and Mike Li and Luca Sbano},
  title        = {A Definition of Cellular Interface Problems},
  booktitle    = {Membrane Computing: 9th International Workshop},
  pages        = {36-62},
  year         = {2009},
  editor       = {David Wolfe Corne and Pierluigi Frisco and Gheorghe P\u{a}un
                  and Grzegorz Rozenberg and Arto Salomaa},
  volume       = {5391},
  series       = {Lecture Notes in Computer Science},
  venue        = {Edinburgh, UK},
  bibdate      = {04/06/09},
}

@inproceedings{Rivero-Gil.etal:2008,
  author       = {Elena Rivero-Gil and Miguel A. Guti{\'e}rrez-Naranjo and
                  {\'A}lvaro Romero-Jim{\'e}nez and Agust{\'i}n
                  Riscos-N{\'u}{\~n}ez},
  title        = {A software tool for generating graphics by means of
                  {P}~systems},
  booktitle    = {International Workshop on Computing with Biomolecules},
  pages        = {87-100},
  year         = {2008},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Rudolf Freund and Marion
                  Oswald and Kai Salomaa},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Neary:2008,
  author       = {Turlough Neary},
  title        = {A small universal spiking neural {P}~system},
  booktitle    = {International Workshop on Computing with Biomolecules},
  pages        = {65-74},
  year         = {2008},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Rudolf Freund and Marion
                  Oswald and Kai Salomaa},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Aman.etal:2008b,
  author       = {Bogdan Aman and Gabriel Ciobanu},
  title        = {Membrane systems with surface objects},
  booktitle    = {International Workshop on Computing with Biomolecules},
  pages        = {17-28},
  year         = {2008},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Rudolf Freund and Marion
                  Oswald and Kai Salomaa},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Besozzi.etal:2008b,
  author       = {Daniela Besozzi and Giancarlo Mauri and Dario Pescini and
                  Claudio Zandron},
  title        = {Membrane systems in systems biology},
  booktitle    = {9th International Workshop on Discrete Event Systems},
  pages        = {275-280},
  year         = {2008},
  venue        = {G{\"o}teborg, Sweden},
  bibdate      = {04/06/09},
}

@inproceedings{Aman.etal:2008,
  author       = {Bogdan Aman and Gabriel Ciobanu},
  title        = {Resource competition and synchronization in membranes},
  booktitle    = {Proceedings of the 10th International Symposium on Symbolic
                  and Numeric Algorithms for Scientific Computing},
  year         = {2008},
  editor       = {Tudor Jebelean and Viorel Negru and Dana Petcu and Daniela
                  Zaharie},
  venue        = {Timi\c{s}oara, Romania},
  bibdate      = {04/06/09},
}

@inproceedings{Krassovitskiy.etal:2008,
  author       = {Alexander Krassovitskiy and Yurii Rogozhin and
                  Sergey Verlan},
  title        = {One-sided insertion and deletion: traditional and {P}~systems
                  case},
  booktitle    = {International Workshop on Computing with Biomolecules},
  pages        = {51-63},
  year         = {2008},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Rudolf Freund and Marion
                  Oswald and Kai Salomaa},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Twycross.etal:2008,
  author       = {Jamie Twycross and Francisco J. Romero-Campero and Malcolm
                  Bennett and Miguel C{\'a}mara and Natalio Krasnogor},
  title        = {Modular assembly of cell systems biology models using
                  {P}~systems},
  booktitle    = {Proceedings of Prague International Workshop on Membrane
                  Computing},
  pages        = {51-62},
  year         = {2008},
  editor       = {Oscar H. Ibarra and Petr Sos{\'i}k},
  venue        = {Prague, Czech Republic},
  bibdate      = {04/06/09},
}

@inproceedings{Muskulus:2008,
  author       = {Michael Muskulus},
  title        = {Identification of {P}~system models assisted by biochemical
                  databases},
  booktitle    = {Proceedings of Prague International Workshop on Membrane
                  Computing},
  pages        = {47-49},
  year         = {2008},
  editor       = {Oscar H. Ibarra and Petr Sos{\'i}k},
  venue        = {Prague, Czech Republic},
  bibdate      = {04/06/09},
}

@inproceedings{Lucanu:2008,
  author       = {Dorel Lucanu},
  title        = {Rewriting logic-based semantics of membrane systems and the
                  maximal concurrency},
  booktitle    = {Proceedings of Prague International Workshop on Membrane
                  Computing},
  pages        = {23-34},
  year         = {2008},
  editor       = {Oscar H. Ibarra and Petr Sos{\'i}k},
  venue        = {Prague, Czech Republic},
  bibdate      = {04/06/09},
}

@inproceedings{Fassler.etal:2008,
  author       = {Raffael Fassler and Thomas Hinze and Thorsten Lenser and
                  Peter Dittrich},
  title        = {Construction of oscillating chemical register machines on
                  binary numbers using mass-action kinetics},
  booktitle    = {Proceedings of Prague International Workshop on Membrane
                  Computing},
  pages        = {11-22},
  year         = {2008},
  editor       = {Oscar H. Ibarra and Petr Sos{\'i}k},
  venue        = {Prague, Czech Republic},
  bibdate      = {04/06/09},
}

@inproceedings{Ciobanu.etal:2008c,
  author       = {Gabriel Ciobanu and Mihai Gontineac},
  title        = {Multisets and their encodings},
  booktitle    = {Proceedings of Prague International Workshop on Membrane
                  Computing},
  pages        = {1-10},
  year         = {2008},
  editor       = {Oscar H. Ibarra and Petr Sos{\'i}k},
  venue        = {Prague, Czech Republic},
  bibdate      = {04/06/09},
}

@inproceedings{Ibarra.etal:2008,
  author       = {Oscar H. Ibarra and Andrei P\u{a}un and Alfonso
                  Rodr{\'i}guez-Pat{\'o}n},
  title        = {Sequentiality induced by spike numbers in {SNP} systems},
  booktitle    = {Proceedings of the 14th International Meeting on DNA
                  Computing},
  pages        = {36-46},
  year         = {2008},
  venue        = {Prague, Czech Republic},
  bibdate      = {04/06/09},
}

@inproceedings{Barbuti.etal:2008d,
  author       = {Roberto Barbuti and Giulio Caravagna and Andrea
                  Maggiolo-Schettini and Paolo Milazzo and Giovanni Pardini},
  title        = {The calculus of looping sequences},
  booktitle    = {Formal Methods for Computational Systems Biology},
  pages        = {387-423},
  year         = {2008},
  editor       = {Marco Bernardo and Pierpaolo Degano and Gianluigi Zavattaro},
  volume       = {5016},
  series       = {Lecture Notes in Computer Science},
  venue        = {Bertinoro, Italy},
  bibdate      = {04/06/09},
}

@inproceedings{Freund.etal:2008c,
  author       = {Rudolf Freund and Sergey Verlan},
  title        = {{P}~systems working in the $k$-restricted minimally parallel
                  derivation mode},
  booktitle    = {International Workshop on Computing with Biomolecules},
  pages        = {43-52},
  year         = {2008},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Rudolf Freund and Marion
                  Oswald and Kai Salomaa},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Zhang.etal:2008c,
  author       = {Xingyi Zhang and Yun Jiang and Linqiang Pan},
  title        = {Small universal spiking neural {P}~systems with exhaustive
                  use of rules},
  booktitle    = {Proceedings of the Third International Conference on
                  Bio-Inspired Computing: Theories and Applications},
  pages        = {117-127},
  year         = {2008},
  venue        = {Adelaide, Australia},
  bibdate      = {04/06/09},
}

@inproceedings{Calude.etal:2008,
  title        = {On the Computational Complexity of Spiking Neural
                  {P}~Systems},
  booktitle    = {Proceedings of the 7th international conference on
                  Unconventional Computing},
  pages        = {189-205},
  year         = {2008},
  editor       = {Cristian S. Calude and Jos{\'e} F{\'e}lix Costa and Rudolf
                  Freund and Marion Oswald and Grzegorz Rozenberg},
  volume       = {5204},
  series       = {Lecture Notes in Computer Science},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Delzanno.etal:2008,
  author       = {Giorgio Delzanno and Laurent Begin},
  title        = {A Biologically Inspired Model with Fusion and Clonation of
                  Membranes},
  booktitle    = {Proceedings of the 7th international conference on
                  Unconventional Computing},
  pages        = {64-82},
  year         = {2008},
  editor       = {Cristian S. Calude and Jos{\'e} F{\'e}lix Costa and Rudolf
                  Freund and Marion Oswald and Grzegorz Rozenberg},
  volume       = {5204},
  series       = {Lecture Notes in Computer Science},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Krishna:2008,
  author       = {Shankara Narayanan Krishna},
  title        = {The Expressiveness of Concentration Controlled {P}~Systems},
  booktitle    = {Proceedings of the 7th international conference on
                  Unconventional Computing},
  pages        = {96-110},
  year         = {2008},
  editor       = {Cristian S. Calude and Jos{\'e} F{\'e}lix Costa and Rudolf
                  Freund and Marion Oswald and Grzegorz Rozenberg},
  volume       = {5204},
  series       = {Lecture Notes in Computer Science},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Yang.etal:2008b,
  author       = {Linmin Yang and Yong Wang and Zhe Dang},
  title        = {Automata on Multisets of Communicating Objects},
  booktitle    = {Proceedings of the 7th international conference on
                  Unconventional Computing},
  pages        = {242-257},
  year         = {2008},
  editor       = {Cristian S. Calude and Jos{\'e} F{\'e}lix Costa and Rudolf
                  Freund and Marion Oswald and Grzegorz Rozenberg},
  volume       = {5204},
  series       = {Lecture Notes in Computer Science},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Stamatopoulou.etal:2005,
  author       = {Ioanna Stamatopoulou and Petros Kefalas and George
                  Eleftherakis and Marian Gheorghe},
  title        = {A modeling language and tool for population {P}~systems},
  booktitle    = {10th Panhellenic Conference on Informatics},
  pages        = {142-152},
  year         = {2005},
  editor       = {Panayiotis Bozanis and Elias N. Houstis},
  venue        = {Volos, Greece},
  bibdate      = {04/06/09},
}

@inproceedings{Ceterchi.etal:2008b,
  author       = {Rodica Ceterchi and Mario J. P{\'e}rez-Jim{\'e}nez and
                  Alexandru Ioan Tomescu},
  title        = {Sorting omega networks simulated with {P}~systems: Optimal
                  data layouts},
  booktitle    = {International Workshop on Computing with Biomolecules},
  pages        = {29-42},
  year         = {2008},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Rudolf Freund and Marion
                  Oswald and Kai Salomaa},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Diaz-Pernil.etal:2008b,
  author       = {Daniel D{\'i}az-Pernil and Miguel A. Guti{\'e}rrez-Naranjo
                  and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n
                  Riscos-N{\'u}{\~n}ez},
  title        = {Solving the partition problem by using tissue-like
                  {P}~systems with cell division},
  booktitle    = {Proceedings of the Third International Conference on
                  Bio-Inspired Computing: Theories and Applications},
  pages        = {43-47},
  year         = {2008},
  venue        = {Adelaide, Australia},
  bibdate      = {04/06/09},
}

@inproceedings{Diaz-Pernil.etal:2008,
  author       = {Daniel D{\'i}az-Pernil and Miguel A. Guti{\'e}rrez-Naranjo
                  and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n
                  Riscos-N{\'u}{\~n}ez},
  title        = {Solving the partition problem by using tissue-like
                  {P}~systems with cell division},
  booktitle    = {Sixth Brainstorming Week on Membrane Computing},
  pages        = {123-134},
  year         = {2008},
  editor       = {Daniel D{\'i}az-Pernil and Carmen Graciani and Miguel Angel
                  Guti{\'e}rrez-Naranjo and Gheorghe P\u{a}un and Ignacio
                  P{\'e}rez-Hurtado and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
  venue        = {Sevilla, Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Binder.etal:2008,
  author       = {Aneta Binder and Rudolf Freund and Marion Oswald},
  title        = {Extended Spiking Neural {P}~Systems with Astrocytes --
                  {V}ariants for modelling the Brain},
  booktitle    = {13th International Symposium on Artificial Life and Robotics},
  pages        = {520-524},
  year         = {2008},
  editor       = {Masanori Sugisaka and Hiroshi Tanaka},
  venue        = {Beppu, Japan},
  bibdate      = {04/06/09},
}

@inproceedings{Alonso.etal:2008,
  author       = {Santiago Alonso and Luis Fern{\'a}ndez, Fernando Arroyo and
                  Javier Gil},
  title        = {Main modules design for a {HW} implementation of massive
                  parallelism in transition {P}~systems},
  booktitle    = {13th International Symposium on Artificial Life and Robotics},
  pages        = {500-504},
  year         = {2008},
  editor       = {Masanori Sugisaka and Hiroshi Tanaka},
  venue        = {Beppu, Japan},
  bibdate      = {04/06/09},
}

@inproceedings{Gutierrez.etal:2008,
  author       = {Abraham Gutierrez and Luis Fern{\'a}ndez and Fernando Arroyo
                  and Santiago Alonso},
  title        = {Suitability of using microcontrollers in implementing new
                  {P}~system communication architectures},
  booktitle    = {13th International Symposium on Artificial Life and Robotics},
  pages        = {496-499},
  year         = {2008},
  editor       = {Masanori Sugisaka and Hiroshi Tanaka},
  venue        = {Beppu, Japan},
  bibdate      = {04/06/09},
}

@inproceedings{Gil.etal:2008,
  author       = {F. Javier Gil and Luis Fern{\'a}ndez and Fernando Arroyo and
                  Juan Alberto de Frutos},
  title        = {Parallel algorithm for {P}~systems implementation in
                  multiprocessors},
  booktitle    = {13th International Symposium on Artificial Life and Robotics},
  pages        = {491-495},
  year         = {2008},
  editor       = {Masanori Sugisaka and Hiroshi Tanaka},
  venue        = {Beppu, Japan},
  bibdate      = {04/06/09},
}

@inproceedings{Bravo.etal:2008,
  author       = {Gin{\'e}s Bravo and Luis Fern{\'a}ndez and M. A. Pena},
  title        = {Hierarchical master-slave architecture for membrane systems
                  implementation},
  booktitle    = {13th International Symposium on Artificial Life and Robotics},
  pages        = {485-490},
  year         = {2008},
  editor       = {Masanori Sugisaka and Hiroshi Tanaka},
  venue        = {Beppu, Japan},
  bibdate      = {04/06/09},
}

@inproceedings{Murphy.etal:2008,
  author       = {Niall Murphy and Damien Woods},
  title        = {A Characterisation of {NL} Using Membrane Systems without
                  Charges and Dissolution},
  booktitle    = {Proceedings of the 7th international conference on
                  Unconventional Computing},
  pages        = {164-176},
  year         = {2008},
  editor       = {Cristian S. Calude and Jos{\'e} F{\'e}lix Costa and Rudolf
                  Freund and Marion Oswald and Grzegorz Rozenberg},
  volume       = {5204},
  series       = {Lecture Notes in Computer Science},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@inproceedings{Krishna.etal:2008,
  author       = {Shankara Narayanan Krishna and Gabriel Ciobanu},
  title        = {On the Computational Power of Enhanced Mobile Membranes},
  booktitle    = {Proceedings of the 4th conference on Computability in Europe:
                  Logic and Theory of Algorithms},
  pages        = {326-335},
  year         = {2008},
  editor       = {Arnold Beckmann and Costas Dimitracopoulos and Benedikt
                  L{\"o}we},
  volume       = {5028},
  series       = {Lecture Notes in Computer Science},
  venue        = {Athens, Greece},
  bibdate      = {04/06/09},
}

@inproceedings{Ibarra.etal:2007c,
  author       = {Oscar H. Ibarra and Sara Woodworth},
  title        = {Spiking Neural {P}~Systems: Some Characterizations},
  booktitle    = {Fundamentals of Computation Theory, 16th International
                  Symposium},
  pages        = {23-37},
  year         = {2007},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Zolt{\'a}n {\'E}sik},
  volume       = {4639},
  series       = {Lecture Notes in Computer Science},
  venue        = {Budapest, Hungary},
  bibdate      = {04/06/09},
}

@inproceedings{Freund.etal:2007c,
  author       = {Rudolf Freund and Mihai Ionescu and Marion Oswald},
  title        = {Extended Spiking Neural {P}~Systems with Decaying Spikes
                  and/or Total Spiking},
  booktitle    = {Proceedings of the International Workshop on Automata for
                  Cellular and Molecular Computing},
  pages        = {64-75},
  year         = {2007},
  editor       = {Gy{\"o}rgy Vaszil},
  venue        = {Budapest, Hungary},
  bibdate      = {04/06/09},
}

@inproceedings{Borrego-Ropero.etal:2007,
  author       = {Rafael Borrego-Ropero and Daniel D{\'i}az-Pernil and Mario
                  J. P{\'e}rez-Jim{\'e}nez},
  title        = {Tissue Simulator: A Graphical Tool for Tissue {P}~Systems},
  booktitle    = {Proceedings of the International Workshop on Automata for
                  Cellular and Molecular Computing},
  pages        = {23-34},
  year         = {2007},
  editor       = {Gy{\"o}rgy Vaszil},
  venue        = {Budapest, Hungary},
  bibdate      = {04/06/09},
}

@inproceedings{Bernardini.etal:2007,
  author       = {Francesco Bernardini and Marian Gheorghe and Maurice
                  Margenstern and Sergey Verlan},
  title        = {How to Synchronize the Activity of All Components of a
                  {P}~System?},
  booktitle    = {Proceedings of the International Workshop on Automata for
                  Cellular and Molecular Computing},
  pages        = {11-22},
  year         = {2007},
  editor       = {Gy{\"o}rgy Vaszil},
  venue        = {Budapest, Hungary},
  bibdate      = {04/06/09},
}

@inproceedings{Kefalas.etal:2007,
  author       = {Petros Kefalas and Ioanna Stamatopoulou and Marian Gheorghe},
  title        = {Principles of Transforming Communicating {X}-Machines to
                  Population {P}~Systems},
  booktitle    = {Proceedings of the International Workshop on Automata for
                  Cellular and Molecular Computing},
  pages        = {76-89},
  year         = {2007},
  editor       = {Gy\"orgy Vaszil},
  venue        = {Budapest, Hungary},
  bibdate      = {04/06/09},
}

@inproceedings{Ionescu.etal:2007b,
  author       = {Mihai Ionescu and Drago\c{s} Sburlan},
  title        = {Some applications of spiking neural {P}~systems},
  booktitle    = {Proceedings of the Eighth Workshop on Membrane Computing},
  pages        = {383-394},
  year         = {2007},
  editor       = {George Eleftherakis and Petros Kefalas and Gheorghe P\u{a}un},
  venue        = {Thessaloniki, Greece},
  bibdate      = {04/06/09},
}

@inproceedings{Ionescu.etal:2007,
  author       = {Mihai Ionescu and Drago\c{s} Sburlan},
  title        = {{P}~systems with adjoining controlled communication rules},
  booktitle    = {Fundamentals of Computation Theory, 16th International
                  Symposium},
  pages        = {353-364},
  year         = {2007},
  editor       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Zolt{\'a}n {\'E}sik},
  volume       = {4639},
  series       = {Lecture Notes in Computer Science},
  venue        = {Budapest, Hungary},
  bibdate      = {04/06/09},
}

@inproceedings{Dunn.etal:2007,
  author       = {Stanley Dunn and Peter Stivers},
  title        = {{P} System Models of Bistable, Enzyme Driven Chemical
                  Reaction Networks},
  booktitle    = {Proceedings of the 2nd international work-conference on The
                  Interplay Between Natural and Artificial Computation, Part I:
                  Bio-inspired Modeling of Cognitive Tasks},
  pages        = {203-213},
  year         = {2007},
  editor       = {Jos{\'e} Mira and Jos{\'e} R. {\'A}lvarez},
  volume       = {4527},
  series       = {Lecture Notes in Computer Science},
  venue        = {La Manga del Mar Menor, Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Mauri.etal:2007,
  author       = {Giancarlo Mauri and Marion J. P{\'e}rez Jim{\'e}nez and
                  Claudio Zandron},
  title        = {On a {P}\u{a}un's Conjecture in Membrane Systems},
  booktitle    = {Proceedings of the 2nd international work-conference on The
                  Interplay Between Natural and Artificial Computation, Part I:
                  Bio-inspired Modeling of Cognitive Tasks},
  pages        = {180-192},
  year         = {2007},
  editor       = {Jos{\'e} Mira and Jos{\'e} R. {\'A}lvarez},
  volume       = {4527},
  series       = {Lecture Notes in Computer Science},
  venue        = {La Manga del Mar Menor, Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Diaz-Pernil.etal:2007,
  author       = {Daniel D{\'i}az-Pernil and Miguel A. Guti{\'e}rrez-Naranjo
                  and Mario J. P{\'e}rez Jim{\'e}nez and Agust{\'i}n
                  Riscos-N{\'u}{\~n}ez},
  title        = {Solving Subset Sum in Linear Time by Using Tissue {P}~Systems
                  with Cell Division},
  booktitle    = {Proceedings of the 2nd international work-conference on The
                  Interplay Between Natural and Artificial Computation, Part I:
                  Bio-inspired Modeling of Cognitive Tasks},
  pages        = {170-179},
  year         = {2007},
  editor       = {Jos{\'e} Mira and Jos{\'e} R. {\'A}lvarez},
  volume       = {4527},
  series       = {Lecture Notes in Computer Science},
  venue        = {La Manga del Mar Menor, Spain},
  bibdate      = {04/06/09},
}

@inproceedings{Krishna:2007b,
  author       = {Shankara Narayanan Krishna},
  title        = {On the Computational Power of Flip-Flop Proteins on
                  Membranes},
  booktitle    = {Proceedings of the 3rd conference on Computability in Europe:
                  Computation and Logic in the Real World},
  pages        = {695-704},
  year         = {2007},
  editor       = {S. Barry Cooper and Benedikt L{\"o}we and Andrea Sorbi},
  volume       = {4497},
  series       = {Lecture Notes in Computer Science},
  venue        = {Siena, Italy},
  bibdate      = {04/06/09},
}

@inproceedings{Freund.etal:2006,
  author       = {Rudolf Freund and Theresia Gschwandtner},
  title        = {{P}~systems for modelling biological processes in living
                  cells},
  booktitle    = {16.~Theorietag Automaten und Formale Sprachen},
  pages        = {46-50},
  year         = {2006},
  editor       = {Rudolf Freund and Marion Oswald},
  venue        = {Vienna, Austria},
  bibdate      = {04/06/09},
}

@article{Csuhaj-Varju.etal:2008b,
  author       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Gheorghe P\u{a}un and Gy{\"o}rgy
                  Vaszil},
  title        = {Tissue-like {P}~systems with dynamically emerging requests},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2008},
  volume       = {19},
  number       = {3},
  pages        = {729-745},
  bibdate      = {04/06/09},
}

@article{Paun:2007,
  author       = {Gheorghe P\u{a}un},
  title        = {Tracing some open problems in membrane computing},
  journal      = {Romanian Journal of Information Science and Technology},
  year         = {2007},
  volume       = {10},
  number       = {4},
  pages        = {303-314},
  bibdate      = {04/06/09},
}

@article{Leporati.etal:toAppear,
  author       = {Alberto Leporati and Daniela Besozzi and Paolo Cazzaniga and
                  Claudio Ferretti and Dario Pescini},
  title        = {Computing with energy and chemical reactions},
  journal      = {Natural Computing},
  year         = {to appear},
  bibdate      = {04/06/09},
}

@article{Gheorghe.etal:toAppear,
  author       = {Marian Gheorghe and Vincenzo Manca and Francisco J.
                  Romero-Campero},
  title        = {Deterministic and stochastic {P}~systems for modeling
                  cellular processes},
  journal      = {Natural Computing},
  bibdate      = {04/06/09},
  year         = {to appear},
}

@article{Kelemen:2008,
  author       = {Jozef Kelemen},
  title        = {Some questions inspired by (membrane computing motivated)
                  language-theoretic models hardware},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {571-580},
  bibdate      = {04/06/09},
}

@article{Nguyen.etal:2008,
  author       = {Van Nguyen and David Kearney and Gianpaolo Gioiosa},
  title        = {An implementation of membrane computing using reconfigurable
                  hardware},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {551-569},
  bibdate      = {04/06/09},
}

@article{Umeki.etal:2008,
  author       = {Mai Umeki and Yasuhiro Suzuki},
  title        = {A Simple Membrane Computing Method for Simulating
                  Bio-Chemical Reactions},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {515-528},
  bibdate      = {04/06/09},
}

@article{Ionescu.etal:2008,
  author       = {Mihai Ionescu and Drago\c{s} Sburlan},
  title        = {Some applications of spiking neural {P}~systems},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {515-528},
  bibdate      = {04/06/09},
}

@article{Cordona.etal:2008,
  author       = {M{\'o}nica Cordona and M. Angels Colomer and Mario
                  J. P{\'e}rez Jim{\'e}nez and Alba Zaragoza},
  title        = {Hierarchical Clustering with Membrane Computing},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {497-513},
  bibdate      = {04/06/09},
}

@article{Cienciala.etal:2008,
  author       = {Lud\v{e}k Cienciala and Lucie Ciencialov{\'a} and
                  Alice Kelemenov{\'a}},
  title        = {Homogeneous P Colonies},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {481-496},
  bibdate      = {04/06/09},
}

@article{Molteni.etal:2008,
  author       = {Davide Molteni and Claudio Ferretti and Giancarlo
                  Mauri},
  title        = {Frequency Membrane Systems},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {467-479},
  bibdate      = {04/06/09},
}

@article{Ramesh.etal:2008,
  author       = {H. Ramesh and Raghavan Rama},
  title        = {Rewriting {P}~Systems with Conditional Communication:
                  Improved Hierarchies},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {453-465},
  bibdate      = {04/06/09},
}

@article{Bonchis.etal:2008,
  author       = {Cosmin Bonchi\c{s} and Cornel Izba\c{s}a and Gabriel
                  Ciobanu},
  title        = {Information Theory over Multisets},
  journal      = {Computing and Informatics},
  year         = {2008},
  volume       = {27},
  number       = {3+},
  pages        = {441-451},
  bibdate      = {04/06/09},
}

@article{Manca:2008,
  author       = {Vincenzo Manca},
  title        = {The metabolic algorithm for {P}~systems: Principles and
                  applications},
  journal      = {Theoretical Computer Science},
  year         = {2008},
  volume       = {404},
  number       = {1-2},
  pages        = {142-155},
  bibdate      = {04/06/09},
}

@article{Csuhaj-Varju.etal:2008,
  author       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy\"orgy Vaszil},
  title        = {(Mem)brane automata},
  journal      = {Theoretical Computer Science},
  year         = {2008},
  volume       = {404},
  number       = {1-2},
  pages        = {52-60},
  bibdate      = {04/06/09},
}

@article{Jack.etal:2008,
  author       = {John Jack and Alfonso Rodr{\'i}guez-Pat{\'o}n and Oscar H. Ibarra
                  and Andrei P\u{a}un},
  title        = {Discrete nondeterministic modeling of the {F}as pathway},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2008},
  volume       = {19},
  number       = {5},
  pages        = {1147-1162},
  bibdate      = {04/06/09},
}

@article{Kari.etal:2008,
  author       = {Lila Kari and Grzegorz Rozenberg},
  title        = {The many facets of natural computing},
  journal      = {Communications of the ACM},
  year         = {2008},
  volume       = {51},
  number       = {10},
  pages        = {72-83},
  bibdate      = {04/06/09},
}

@article{Barbuti.etal:2008c,
  author       = {Roberto Barbuti and Andrea Maggiolo-Schettini and Paolo
                  Milazzo and Angelo Troina},
  title        = {Bisimulations in calculi modelling membranes},
  journal      = {Formal Aspects of Computing},
  year         = {2008},
  volume       = {20},
  number       = {4-5},
  pages        = {351-377},
  bibdate      = {04/06/09},
}

@article{Kleijn.etal:toAppear,
  author       = {Jetty Kleijn and Maciej Koutny},
  title        = {A {P}etri net model for membrane systems with dynamic
                  structure},
  journal      = {Natural Computing},
  bibdate      = {04/06/09},
  year         = {to appear},
}

@article{Kleijn.etal:2008,
  author       = {Jetty Kleijn and Maciej Koutny},
  title        = {Processes of membrane systems with promoters and inhibitors},
  journal      = {Theoretical Computer Science},
  year         = {2008},
  volume       = {404},
  number       = {1-2},
  pages        = {112-126},
  bibdate      = {04/06/09},
}

@article{Dovier.etal:2008,
  author       = {Agostino Dovier and Carla Piazza and Gianfranco Rossi},
  title        = {A uniform approach to constraint-solving for lists
                  multisets, compact lists, and sets},
  journal      = {ACM Transactions on Computational Logic},
  year         = {2008},
  volume       = {9},
  number       = {3},
  pages        = {15:1-15:30},
  bibdate      = {04/06/09},
}

@article{Castellini.etal:toAppear,
  author       = {Alberto Castellini and Giuditta Franco and Vincenzo Manca},
  title        = {Hybrid Functional {P}etri Nets as {MP} systems},
  journal      = {Natural Computing},
  year         = {to appear},
  bibdate      = {04/06/09},
}

@article{Huang.etal:2008,
  author       = {Chunyi Huang and Xiaoju Dong},
  title        = {Maximally parallel attribute on {P}~Systems: Properties and
                  applications},
  journal      = {Progress in Natural Science},
  year         = {2008},
  volume       = {18},
  number       = {5},
  pages        = {629-632},
  bibdate      = {04/06/09},
}

@article{Brijder.etal:2008,
  author       = {Robert Brijder and Matteo Cavaliere and Agust{\'i}n
                  Riscos-N{\'u}{\~n}ez and Grzegorz Rozenberg and Drago\c{s},
                  Sburlan},
  title        = {Membrane systems with proteins embedded in membranes},
  journal      = {Theoretical Computer Science},
  year         = 2008,
  volume       = 404,
  number       = {1-2},
  pages        = {26-39},
  bibdate      = {04/06/09},
}

@article{Martinez.etal:2007,
  author       = {Victor Martinez and Luis Fernandez and Fernando Arroyo and
                  Abraham Gutierrez},
  title        = {{HW} implementation of a optimized algorithm for the
                  application of active rules in a transition {P}-system},
  journal      = {International Journal on Information Theory and Applications},
  year         = {2007},
  volume       = {14},
  number       = {4},
  pages        = {324-331},
  bibdate      = {04/06/09},
}

@article{Cavaliere.etal:2008b,
  author       = {Matteo Cavaliere and Radu Mardare and Sean Sedwards},
  title        = {A multiset-based model of synchronizing agents: Computability
                  and robustness},
  journal      = {Theoretical Computer Science},
  year         = {2008},
  volume       = {391},
  number       = {3},
  pages        = {216-238},
  bibdate      = {04/06/09},
}

@article{Ishdorj.etal:2008,
  author       = {Tseren-Onolt Ishdorj and Alberto Leporati},
  title        = {Uniform solutions to {SAT} and {3-SAT} by spiking neural {P},
                  systems with pre-computed resources},
  journal      = {Natural Computing},
  year         = {2008},
  volume       = {7},
  number       = {4},
  pages        = {519-534},
  bibdate      = {04/06/09},
}

@article{Romero-Campero.etal:2008b,
  author       = {Francisco J. Romero-Campero and Mario J. P{\'e}rez-Jim{\'e}nez},
  title        = {A model of the quorum sensing system in {V}ibrio fischeri
                  using {P}~systems},
  journal      = {Artificial Life},
  year         = {2008},
  volume       = {14},
  number       = {1},
  pages        = {95-109},
  bibdate      = {04/06/09},
}

@article{Cavaliere.etal:2008,
  author       = {Matteo Cavaliere and Ivan Mura},
  title        = {Experiments on the reliability of stochastic spiking neural
                  {P}~systems},
  journal      = {Natural Computing},
  year         = {2008},
  volume       = {7},
  number       = {4},
  pages        = {453-470},
  bibdate      = {04/06/09},
}

@article{Huang.etal:2009,
  author       = {Liang Huang and Il Hong Suh},
  title        = {Controller design for a marine diesel engine using membrane
                  computing},
  journal      = {International Journal of Innovative Computing, Information
                  and Control},
  year         = {2009},
  volume       = {5},
  number       = {4},
  pages        = {899-912},
  bibdate      = {04/06/09},
}

@article{Huang.etal:2007,
  author       = {Liang Huang and Lei Sun and Ning Wang and Xiaoming Jin},
  title        = {Multiobjective optimization of simulated moving bed by tissue
                  {P}~system},
  journal      = {Chinese Journal of Chemical Engineering},
  year         = {2007},
  volume       = {15},
  number       = {5},
  pages        = {683-690},
  bibdate      = {04/06/09},
}

@article{Freund.etal:2008b,
  author       = {Rudolf Freund and Marion Oswald},
  title        = {Regular omega-languages defined by finite extended spiking
                  neural {P}~systems},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {83},
  number       = {1-2},
  pages        = {65-73},
  bibdate      = {04/06/09},
}

@article{Alhazov:2008,
  author       = {Artiom Alhazov},
  title        = {Ciliate operations without context in a membrane computing
                  framework},
  journal      = {Romanian Journal of Information Science and Technology},
  year         = {2008},
  volume       = {10},
  number       = {4},
  pages        = {315-322},
  bibdate      = {04/06/09},
}

@article{Nishida:2007,
  author       = {Taishin Y. Nishida},
  title        = {Membrane algorithm with brownian subalgorithm and genetic
                  subalgorithm},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2007},
  volume       = {18},
  number       = {6},
  pages        = {1353-1360},
  bibdate      = {04/06/09},
}

@article{Ibarra.etal:2007b,
  author       = {Oscar H. Ibarra and Sara Woodworth},
  title        = {Characterizing regular languages by spiking neural {P}~systems},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2007},
  volume       = {18},
  number       = {6},
  pages        = {1247-1256},
  bibdate      = {04/06/09},
}

@article{Gao.etal:2007,
  author       = {Yan Gao and Hendrik Jan Hoogeboom},
  title        = {{P}~systems with single passenger carriers},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2007},
  volume       = {18},
  number       = {6},
  pages        = {1227-1235},
  bibdate      = {04/06/09},
}

@article{Freund.etal:2008,
  author       = {Rudolf Freund and Mihai Ionescu and Marion Oswald},
  title        = {Extended spiking neural {P}~systems with decaying spikes and/or
                  total spiking},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2008},
  volume       = {19},
  number       = {5},
  pages        = {1223-1234},
  bibdate      = {04/06/09},
}

@article{Bernardini.etal:2008,
  author       = {Francesco Bernardini and Marian Gheorghe and Maurice
                  Margenstern and Sergey Verlan},
  title        = {How to synchronize the activity of all components of
                  a {P}~system?},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2008},
  volume       = {19},
  number       = {5},
  pages        = {1183-1198},
  bibdate      = {04/06/09},
}

@article{Annadurai.etal:2008b,
  author       = {Subbaiah Annadurai and Thiyagarajan Kalyani and Vincent
                  Rajkumar Dare and Durairaj Gnanaraj Thomas},
  title        = {Trajectory {P}~systems},
  journal      = {Progress in Natural Science},
  year         = {2008},
  volume       = {18},
  number       = {5},
  pages        = {611-616},
  bibdate      = {04/06/09},
}

@article{Annadurai.etal:2008,
  author       = {Subbaiah Annadurai and Thiyagarajan Kalyani and Vincent
                  Rajkumar Dare and Durairaj Gnanaraj Thomas},
  title        = {{P}~systems generating iso-picture languages},
  journal      = {Progress in Natural Science},
  year         = {2008},
  volume       = {18},
  number       = {5},
  pages        = {617-622},
  bibdate      = {04/06/09},
}

@article{Xian:2007,
  author       = {Xu Xian},
  title        = {Tissue {P}~systems with parallel rules on channels},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {486-491},
  bibdate      = {04/06/09},
}

@article{Subramanian.etal:2007,
  author       = {K. G. Subramanian and R. Saravanan and M. Geethalakshmr and
                  P. Helen Chandra and M. Margenstern},
  title        = {{P}~systems with array objects and array rewriting rules},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {479-485},
  bibdate      = {04/06/09},
}

@article{Leporati.etal:2007b,
  author       = {Alberto Leporati and Claudio Zandron and Giancarlo Mauri},
  title        = {Solving the factorization problem with {P}~systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {471-478},
  bibdate      = {04/06/09},
}

@article{Korczynski:2007,
  author       = {Waldemar Korczynski},
  title        = {Paun's systems as models of economic systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {466-470},
  bibdate      = {04/06/09},
}

@article{Liang.etal:2007,
  author       = {Huang Liang and He Xiongxiong and Wang Ning and Xie Yi},
  title        = {{P}~systems based multi-objective optimization algorithm},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {458-465},
  bibdate      = {04/06/09},
}

@article{Gutierrez-Naranjo.etal:2007b,
  author       = {Miguel A. Guti{\'e}rrez-Naranjo and Mario
                  J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez
                  and Francisco J. Romero-Campero},
  title        = {How to express tumours using membrane systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {449-457},
  bibdate      = {04/06/09},
}

@article{Freund.etal:2007b,
  author       = {Rudolf Freund and  Marion Oswald and Thomas Schirk},
  title        = {How a membrane agent buys goods in a membrane store},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {442-448},
  bibdate      = {04/06/09},
}

@article{Ciobanu.etal:2007,
  author       = {Gabriel Ciobanu and Laura Cornacel},
  title        = {Probabilistic transitions for {P}~systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {431-441},
  bibdate      = {04/06/09},
}

@article{Cheruku.etal:2007,
  author       = {Smitha Cheruku and Andrei P\u{a}un and Francisco
                  J. Romero-Campero and Mario J. P{\'e}rez-Jim{\'e}nez and
                  Oscar H. Ibarra},
  title        = {Simulating {FAS}-induced apoptosis by using
                  {P}~systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {424-431},
  bibdate      = {04/06/09},
}

@article{Haiming.etal:2007,
  author       = {Chen Haiming and Tseren-Onolt Ishdorj and Gheorghe P\u{a}un},
  title        = {Computing along the axon},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {417-423},
  bibdate      = {04/06/09},
}

@article{Bonchis.etal:2007,
  author       = {Cosmin Bonchis and Cornel Izbasa and Gabriel Ciobanu},
  title        = {Compositional asynchronous membrane systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {411-416},
  bibdate      = {04/06/09},
}

@article{Binder.etal:2007,
  author       = {Aneta Binder and Rudolf Freund and Georg Lojka and Marion
                  Oswald},
  title        = {Applications of membrane systems in distributed systems},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {401-409},
  bibdate      = {04/06/09},
}

@article{Besozzi.etal:2007,
  author       = {Daniela Besozzi and Paolo Cazzaniga and Dario Pescini and
                  Giancarlo Mauri},
  title        = {Seasonal variance in {P}~system models for metapopulations},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {392-400},
  bibdate      = {04/06/09},
}

@article{Manca:2007,
  author       = {Vincenzo Manca},
  title        = {Metabolic {P}~systems for biochemical dynamics},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {384-391},
  bibdate      = {04/06/09},
}

@article{Romero-Campero.etal:2007,
  author       = {Francisco J. Romero-Campero and Marian Gheorghe and Gabriel
                  Ciobanu and John M. Auld and Mario J. P{\'e}rez-Jim{\'e}nez},
  title        = {Cellular modelling using {P}~systems and process algebra},
  journal      = {Progress in Natural Science},
  year         = {2007},
  volume       = {17},
  number       = {4},
  pages        = {375-383},
  bibdate      = {04/06/09},
}

@article{Yang.etal:2008,
  author       = {Linmin Yang and Zhe Dang and Oscar H. Ibarra},
  title        = {On stateless automata and {P}~systems},
  journal      = {Intenational Journal of Foundations of Computer Science},
  year         = {2008},
  volume       = {19},
  number       = {5},
  pages        = {1259-1276},
  bibdate      = {04/06/09},
}

@article{Mardare.etal:2008,
  author       = {Radu Mardare and Matteo Cavaliere and Sean Sedwards},
  title        = {A logical characterization of robustness, mutants and species
                  in colonies of agents},
  journal      = {Intenational Journal of Foundations of Computer Science},
  year         = {2008},
  volume       = {19},
  number       = {5},
  pages        = {1199-1221},
  bibdate      = {04/06/09},
}

@article{Vitale.etal:2008,
  author       = {Antonio Vitale and Giancarlo Mauri and Claudio Zandron},
  title        = {Simulation of a bounded symport/antiport {P}~system with
                  {B}rane calculi},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {558-571},
  bibdate      = {04/06/09},
}

@article{Fontana.etal:2008,
  author       = {Federico Fontana and Vincenzo Manca},
  title        = {Predator-prey dynamics in {P}~systems ruled by metabolic
                  algorithm},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {545-557},
  bibdate      = {04/06/09},
}

@article{Corne.etal:2008,
  author       = {David W. Corne and Pierluigi Frisco},
  title        = {Dynamics of {HIV} infection studied with cellular automata
                  and conformon-{P} systems},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {531-544},
  bibdate      = {04/06/09},
}

@article{Ciobanu.etal:2008b,
  author       = {Gabriel Ciobanu and Bogdan Aman},
  title        = {On the relationship between membranes and ambients},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {515-530},
  bibdate      = {04/06/09},
}

@article{Besozzi.etal:2008,
  author       = {Daniela Besozzi and Paolo Cazzaniga and Dario Pescini and
                  Giancarlo Mauri},
  title        = {Modelling metapopulations with stochastic membrane systems},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {499-514},
  bibdate      = {04/06/09},
}

@article{Manca.etal:2008,
  author       = {Vincenzo Manca and Luca Bianco},
  title        = {Biological networks in metabolic {P}~systems},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {489-498},
  bibdate      = {04/06/09},
}

@article{Franco.etal:2008,
  author       = {Giuditta Franco and Nata\v{s}a Jonoska and Barbara Osborn and
                  Anna Plaas},
  title        = {Knee joint injury and repair modeled by membrane systems},
  journal      = {Biosystems},
  year         = 2008,
  volume       = 91,
  number       = 3,
  pages        = {473-488},
  bibdate      = {04/06/09},
}

@article{Spicher.etal:2008,
  author       = {Antoine Spicher and Olivier Michel and Mikolaj Cieslak and
                  Jean-Louis Giavitto and Przemyslaw Prusinkiewicz},
  title        = {Stochastic {P}~systems and the simulation of biochemical
                  processes with dynamic compartments},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {458-472},
  bibdate      = {04/06/09},
}

@article{Romero-Campero.etal:2008,
  author       = {Francisco J. Romero-Campero and Mario J. P{\'e}rez-Jim{\'e}nez},
  title        = {Modelling gene expression control using {P}~systems: The
                  {L}ac {O}peron, a case study},
  journal      = {Biosystems},
  year         = {2008},
  volume       = {91},
  number       = {3},
  pages        = {438-457},
  bibdate      = {04/06/09},
}

@article{Gheorghe.etal:2008,
  author       = {Marian Gheorghe and Natalio Krasnogor and Miguel Camara},
  title        = {{P}~systems applications to systems biology},
  journal      = {Biosystems},
  year         = 2008,
  volume       = 91,
  number       = 3,
  pages        = {435-437},
  bibdate      = {04/06/09},
}

@article{Zhang.etal:2008b,
  author       = {Xingyi Zhang and Xiangxiang Zeng and Linqiang Pan},
  title        = {Smaller Universal Spiking Neural {P}~Systems},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {117-136},
  bibdate      = {04/06/09},
}

@article{Zhang.etal:2008,
  author       = {Ge-Xiang Zhang and Marian Gheorghe and Chao-Zhong Wu},
  title        = {A Quantum-Inspired Evolutionary Algorithm Based on {P}~systems
                  for Knapsack Problem},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {93-116},
  bibdate      = {04/06/09},
}

@article{Zandron.etal:2008,
  author       = {Claudio Zandron and Alberto Leporati and Claudio Ferretti and
                  Giancarlo Mauri and Mario J. P{\'e}rez-Jim{\'e}nez },
  title        = {On the Computational Efficiency of Polarizationless
                  Recognizer {P}~Systems with Strong Division and Dissolution},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {79-91},
  bibdate      = {04/06/09},
}

@article{Leporati.etal:2008,
  author       = {Alberto Leporati and Miguel A. Guti{\'e}rrez-Naranjo},
  title        = {Solving Subset Sum by Spiking Neural {P}~Systems with
                  Pre-computed Resources},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {61-77},
  bibdate      = {04/06/09},
}

@article{Ciobanu.etal:2008,
  author       = {Gabriel Ciobanu and Andreas Resios},
  title        = {Computational Complexity of Simple {P}~Systems},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {49-59},
  bibdate      = {04/06/09},
}

@article{Ceterchi.etal:2008,
  author       = {Rodica Ceterchi and Alexandru Ioan Tomescu},
  title        = {Implementing Sorting Networks with Spiking Neural {P}~Systems},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {35-48},
  bibdate      = {04/06/09},
}

@article{Barbuti.etal:2008b,
  author       = {Roberto Barbuti and Andrea Maggiolo-Schettini and Paolo
                  Milazzo and Simone Tini},
  title        = {A {P} Systems Flat Form Preserving Step-by-step Behaviour},
  journal      = {Fundamenta Informaticae},
  year         = {2008},
  volume       = {87},
  number       = {1},
  pages        = {1-34},
  bibdate      = {04/06/09},
}

@article{Muskulus.etal:2007,
  author       = {Michael Muskulus and Daniela Besozzi and Robert Brijder and
                  Paolo Cazzaniga and Sanne Houweling and Dario Pescini and
                  Grzegorz Rozenberg},
  title        = {Cycles and communicating classes in membrane systems and
                  molecular dynamics},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  bibdate      = {04/06/09},
}

@article{Leporati.etal:2007,
  author       = {Alberto Leporati and Sara Felloni},
  title        = {Three ``quantum'' algorithms to solve {3-SAT}},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {218-241},
  bibdate      = {04/06/09},
}

@article{Ibarra.etal:2007,
  author       = {Oscar H. Ibarra and Andrei P\u{a}un and Gheorghe P\u{a}un and
                  Alfonso Rodr{\'i}guez-Pat{\'o}n and Petr Sos{\'i}k and Sara
                  Woodworth},
  title        = {Normal forms for spiking neural {P}~systems},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {196-217},
  bibdate      = {04/06/09},
}

@article{Gutierrez-Naranjo.etal:2007,
  author       = {Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
                  and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
  title        = {On the degree of parallelism in membrane systems},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {183-195},
  bibdate      = {04/06/09},
}

@article{Fontana.etal:2007,
  author       = {Federico Fontana and Vincenzo Manca},
  title        = {Discrete solutions to differential equations by metabolic P
                  systems},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {165-182},
  bibdate      = {04/06/09},
}

@article{Csuhaj-Varju.etal:2007,
  author       = {Erzs{\'e}bet Csuhaj-Varj{\'u} and Maurice Margenstern and
                  Gy\"orgy Vaszil and Sergey Verlan},
  title        = {On small universal antiport {P}~systems},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {152-164},
  bibdate      = {04/06/09},
}

@article{Cavaliere.etal:2007,
  author       = {Matteo Cavaliere and Rudolf Freund and Marion Oswald and
                  Drago\c{s} Sburlan},
  title        = {Multiset random context grammars, checkers, and transducers},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {136-151},
  bibdate      = {04/06/09},
}

@article{Busi:2007,
  author       = {Nadia Busi},
  title        = {Using well-structured transition systems to decide divergence
                  for catalytic {P}~systems},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {372},
  number       = {2-3},
  pages        = {125-135},
  bibdate      = {04/06/09},
}

@article{Barbuti.etal:2008,
  author       = {Roberto Barbuti and Andrea Maggiolo-Schettini and Paolo
                  Milazzo and Simone Tini},
  title        = {Compositional semantics and behavioral equivalences for {P}~Systems},
  journal      = {Theoretical Computer Science},
  year         = {2008},
  volume       = {395},
  number       = {1},
  pages        = {77-100},
  bibdate      = {04/06/09},
}

@article{Krishna:2007,
  author       = {Shankara N. Krishna},
  title        = {Universality results for {P}~systems based on brane calculi
                  operations},
  journal      = {Theoretical Computer Science},
  year         = {2007},
  volume       = {371},
  number       = {1-2},
  pages        = {83-105},
  bibdate      = {04/06/09},
}

@article{Gutierrez-Naranjo.etal:2006,
  author       = {Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
                  and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Francisco J.
                  Romero-Campero},
  title        = {Computational efficiency of dissolution rules in membrane
                  systems},
  journal      = {International Journal of Computer Mathematics},
  year         = {2006},
  volume       = {83},
  number       = {7},
  pages        = {593-611},
  bibdate      = {04/06/09},
}

@article{Bianco.etal:2006,
  author       = {Luca Bianco and Vincenzo Manca},
  title        = {Symbolic generation and representation of complex
                  oscillations},
  journal      = {International Journal of Computer Mathematics},
  year         = {2006},
  volume       = {83},
  number       = {7},
  pages        = {549-568},
  bibdate      = {04/06/09},
}

@article{Nagy.etal:2006,
  author       = {Benedek Nagy and Laszlo Szegedi},
  title        = {Membrane computing and geographical operating systems},
  journal      = {Journal of Universal Computer Science},
  year         = {2006},
  volume       = {12},
  number       = {9},
  pages        = {1312-1331},
  bibdate      = {04/06/09},
}

@article{Alhazov.etal:2006,
  author       = {Artiom Alhazov and Yurii Rogozhin},
  title        = {Generating languages by {P}~systems with minimal
                  symport/antiport},
  journal      = {The Computer Science Journal of Moldova},
  year         = {2006},
  volume       = {14},
  number       = {3},
  pages        = {299-323},
  bibdate      = {04/06/09},
}

@article{Freund.etal:2007,
  author       = {Rudolf Freund and Marion Oswald},
  title        = {Partial halting in {P}~systems},
  journal      = {International Journal of Foundations of Computer Science},
  year         = {2007},
  volume       = {18},
  number       = {6},
  pages        = {1215-1225},
  bibdate      = {04/06/09},
}

@article{Sosik.etal:2007,
  author       = {Petr Sos{\'i}k and Alfonso Rodr{\'i}guez-Pat{\'o}n},
  title        = {Membrane computing and complexity theory: A characterization
                  of {PSPACE}},
  journal      = {Journal of Computer and System Sciences},
  year         = {2007},
  volume       = {73},
  number       = {1},
  pages        = {137-152},
  bibdate      = {04/06/09},
}

@article{Verlan.etal:2008b,
  author       = {Sergey Verlan and Francesco Bernardini and Marian Gheorghe
                  and Maurice Margenstern},
  title        = {Generalized communicating {P}~systems},
  journal      = {Theoretical Computer Science},
  year         = {2008},
  volume       = {404},
  number       = {1-2},
  pages        = {170-184},
  bibdate      = {04/06/09},
}

@article{Subramanian.etal:2009,
  author       = {K. G. Subramanian and Rosihan M. Ali and Atulya K. Nagar and
                  Maurice Margenstern},
  title        = {Array {P} Systems and t-Communication},
  journal      = {Fundamenta Informaticae},
  year         = {2009},
  volume       = {91},
  number       = {1},
  pages        = {145-159},
  bibdate      = {04/06/09},
}

@article{Zhang:2009,
  author       = {Zhang, Yao; Huang, Liang},
  title        = {A variant of P systems for optimization},
  journal      = {NEUROCOMPUTING},
  volume       = {72},
  number       = {4-6},
  year         = {2009},
  pages        = {1355-1360},
  bibdate      = {03/11/09},
}

@techreport{Cavaliere:Modelling_Cellular_Processes:TR7/2006,
  author       = {Matteo Cavaliere and S. Sedwards},
  title        = {Modelling Cellular Processes using Membrane Systems with Peripheral and
                  Integral Proteins},
  institution  = {Microsoft Research - University of Trento, Centre for Computational and
                  Systems Biology},
  address      = {Trento, Italy},
  number       = {07/2006},
  note         = {Technical Report 7/2006, Microsoft Research - University of Trento, Centre
                  for Computational and Systems Biology},
}

@techreport{Paun:CDMTCS_TR_101:Multiset_Proces:U,
	author={Gheorghe P{\u a}un and Gabriel Thierrin},
	title={Multiset Processing by Means of Systems of Finite State Transducers},
	institution={University of Auckland},
	number={101},
	note={CDMTCS Report (www.cs.auckland.ac.nz/CDMTCS)}
}

@techreport{Paun:TUCS_208_98:Computing_with:98,
	author={Gheorghe P{\u a}un},
	title={Computing with Membranes},
	institution={Turku Center for Computer Science-TUCS},
	year={1998},
	number={208},
	note={(www.tucs.fi)}
}

@techreport{Paun:TUCS_218_98:Membrane_Comput:98,
	author={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	title={Membrane Computing with External Output},
	institution={Turku Center for Computer Science-TUCS},
	year={1998},
	number={218},
	note={Report No 218 (www.tucs.fi)}
}

@techreport{Paun:UWO_TR_539_00:On_Synchronizat:99,
	author={Gheorghe P{\u a}un and Sheng Yu},
	title={On Synchronization in {P} systems},
	institution={University of Western Ontario},
	year={1999},
	address={Ontario, Canada},
	number={539},
	note={Report TR 539 (www.csd.uwo.ca/faculty/syu/TR539.html)}
}

@techreport{Calude:CDMTCS_117:Glimpse:2000,
	author={Cristian S. Calude and Gheorghe P{\u a}un and Monica Tatar{\^a}m},
	title={A Glimpse into Natural Computing},
	institution={CDMTCS University of Auckland},
	year={2000},
	number={117}
}

@techreport{Atanas:RiVU_TR_14_00:P_Systems_and_C:00,
	author={Adrian Atanasiu and Carlos Mart{\'i}n-Vide},
	title={{P} systems and Context-Free Languages},
	institution={Rovira i Virgili University},
	year={2000},
	address={Tarragona, Spain},
	number={14/00},
	note={Technical Report 14/00 of Research Group on Mathematical Linguistics},
	pages={37--51}
}

@techreport{Paun:CDMTCS_TR_119_00:Computing_with:00,
	author={Gheorghe P{\u a}un},
	title={Computing with Membranes ({P} systems): Twenty Six Research Topics},
	institution={University of Auckland},
	year={2000},
	number={119},
	note={CDMTCS TR 119 (www.cs.auckland.ac.nz/ CDMTCS)}
}

@techreport{Castel:CDMTCS_TR_123_00:P_Systems_with:00,
	author={Juan Castellanos and Gheorghe P{\u a}un and Alfonso Rodr{\'i}guez-Pat{\'o}n},
	title={{P} systems with Worm-Objects},
	institution={University of Auckland},
	year={2000},
	number={123},
	note={www.cs.auckland.ac.nz/CDMTCS}
}

@techreport{Kudlek:CDMTCS_TR_140_00:Toward_FMT_(For:00,
	author={Manfred Kudlek and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Toward {FMT} ({F}ormal {M}acroset {T}heory)},
	institution={University of Auckland},
	year={2000},
	number={140},
	pages={149--158}
}

@techreport{Malita:CDMTCS_TR_140_00:Membrane_Comput:00,
	author={Mihaela Malita},
	title={Membrane Computing in {P}rolog},
	institution={University of Auckland},
	year={2000},
	number={140},
	pages={159--175}
}

@techreport{Frisco:CDMTCS_TR_140_00:Membrane_Comput:00,
	author={Pierluigi Frisco},
	title={Membrane Computing Based on Splicing: Improvements},
	institution={University of Auckland},
	year={2000},
	number={140},
	pages={100--111}
}

@techreport{Rama:CDMTCS_TR_140_00:Computing_with:00,
	author={Raghavan Rama},
	title={Computing with {P} systems},
	institution={University of Auckland},
	year={2000},
	number={140},
	pages={218--235}
}

@techreport{NKri:CDMTCS_TR_140_00:Computing_with:00,
	author={Shankara Narayanan Krishna},
	title={Computing with Simple {P} systems},
	institution={University of Auckland},
	year={2000},
	number={140},
	pages={124--137}
}

@techreport{Manca:CDMTCS_TR_140_00:Monoidal_System:00,
	author={Vincenzo Manca},
	title={Monoidal Systems and Membrane Systems},
	institution={University of Auckland},
	year={2000},
	number={140},
	note={CDMTCS TR 140},
	pages={176--190}
}

@techreport{Suzuki:CDMTCS_TR_140_00:Artificial_Life:00,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={Artificial Life and {P} systems},
	institution={University of Auckland},
	year={2000},
	number={140},
	pages={265--285}
}

@techreport{Atanas:RiVU_TR_17_01:Recursive_Calcu:01,
	author={Adrian Atanasiu and Carlos Mart{\'i}n-Vide},
	title={Recursive Calculus with Membranes},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={31--44}
}

@techreport{Paun:RiVU_TR_17_01:P_Systems_with:01,
	author={Andrei P{\u a}un},
	title={{P} systems with String-Objects: Universality Results},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={229--242}
}

@techreport{Martin:RiVU_TR_21_01:Elements_of_For:01,
	author={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Elements of Formal Language Theory for Membrane Computing},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={21/01},
	note={Technical Report 21/01 of Research Group on Mathematical Linguistics}
}

@techreport{Ferret:RiVU_TR_17_01:On_Three_Varian:01,
	author={Claudio Ferretti and Giancarlo Mauri and Gheorghe P{\u a}un and Claudio
		Zandron},
	title={On Three Variants of {P} systems with String-Objects},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={63--76}
}

@techreport{Nico:RiVU_TR_17_01:A_C_Library_f:01,
	author={Dan V. {Nicolau Jr.} and Gerardin Solana and Florin Fulga and Dan V. {Nicolau
		Sr.}},
	title={A "{C}" Library for Implementing {P} systems on the Electronic Computer
		(Abstract)},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={221--222}
}

@techreport{Arroyo:RiVU_TR_17_01:A_Recursive_Alg:01,
	author={Fernando Arroyo and Angel V. Baranda and Juan Castellanos and Carmen Luengo
		and Luis F. Mingo},
	title={A Recursive Algorithm for Describing Evolution in Transition {P} systems},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={19--30}
}

@techreport{Cioban:RiVU_TR_17_01:Gene_Expression:01,
	author={Gabriel Ciobanu and Bogdan Tanasa},
	title={Gene Expression by Software Mechanisms.},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={51--62}
}

@techreport{Cioban:RiVU_TR_17_01:Membrane_Softwa:01,
	author={Gabriel Ciobanu and Dorin Paraschiv},
	title={Membrane Software. A {P} system Simulator},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={45--50}
}

@techreport{Paun:RiVU_TR_17_01:Further_Researc:01,
	author={Gheorghe P{\u a}un},
	title={Further Research Topics About {P} systems},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={243--250}
}

@techreport{LGia:RiVU_TR_17_01:MGS:_Implementi:01,
	author={Jean Louis Giavitto and Olivier Michel},
	title={{MGS}: Implementing a Unified View on Four Biologically Inspired Computing
		Models},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={107--122}
}

@techreport{Aguado:RiVU_TR_17_01:P_Systems_with:01,
  author       = {Joaqu{\'i}n Aguado and Tudor Balanescu and Tony Cowling and Marian Gheorghe
                  and Florentin Ipate},
  title        = {{P} systems with Replicated Rewriting and Stream {X-Machines}},
  institution  = {Rovira i Virgili University},
  year         = {2001},
  address      = {Tarragona, Spain},
  number       = {17/01},
  note         = {Technical Report 17/01 of Research Group on Mathematical Linguistics},
  pages        = {7--18},
}

@techreport{Mate:RiVU_TR_17_01:On_the_Power_of:01,
	author={Jos{\'e} L. Mat{\'e} and Alfonso Rodr{\'i}guez-Pat{\'o}n and Andr{\'e}s Silva},
	title={On the Power of {P} systems with {DNA-Worms}},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={209--220}
}

@techreport{Subramanian:RiVU_TR_17_01:self_crosover:01,
	author={K.G. Subramanian and D.G. Thomas and M.H. Begum and P.H. Chandra},
	title={A note on self crossover and splicing {P} systems},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={259--266}
}

@techreport{Frisco:RiVU_TR_17_01:A_Direct_Constr:01,
	author={Pierluigi Frisco and Hendrik Jan Hoogeboom and Paul Sant},
	title={A Direct Construction of a Universal {P} system},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={89--106}
}

@techreport{Freund:RiVU_TR_17_01:Variants_of_GP:01,
	author={Rudolf Freund and Marion Oswald},
	title={Variants of {GP Systems}},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={77--88.}
}

@techreport{Kris:RiVU_TR_17_01:On_the_Power_of:01,
	author={Shankara Narayanan Krishna and K. Lakshmanan and Raghavan Rama},
	title={On the Power of {P} systems with Contextual Rules},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={143--156}
}

@techreport{Marcus:RiVU_TR_17_01:Membranes_versu:01,
	author={Solomon Marcus},
	title={Membranes versus {DNA}},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={193--198}
}

@techreport{Ji:RiVU_TR_17_01:The_Bhopalator:01,
	author={Sungchul Ji},
	title={The {Bhopalator}: An Information/Energy Dual Model of the Living Cell},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={123--142}
}

@techreport{Nish:RiVU_TR_17_01:Simulations_of:01,
	author={Taishin Yasunobu Nishida},
	title={Simulations of Photosynthesis by a {K-Subset} Transforming System with Membranes},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={223--228}
}

@techreport{Manca:RiVU_TR_17_01:Membrane_Algori:01,
	author={Vincenzo Manca},
	title={Membrane Algorithms for Propositional Satisfiability},
	institution={Rovira i Virgili University},
	year={2001},
	address={Tarragona, Spain},
	number={17/01},
	note={Technical Report 17/01 of Research Group on Mathematical Linguistics},
	pages={181--192}
}

@techreport{Martin:TUCS_421_01:Tissue_P_System:01,
	author={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un and J. Pazos and Alfonso Rodr{\'i}guez-Pat{\'o}n},
	title={Tissue {P} systems},
	institution={Turku Center for Computer Science-TUCS},
	year={2001},
	month={September},
	number={421},
	note={TUCS Technical Report 421}
}

@techreport{Obtulo:RiVU_TR_26_03:Mathematical_Mo:03,
	author={Adam Obtulowicz},
	title={Mathematical Models of Uncertainty with a Regard to Membrane Systems},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Cordon:RiVU_TR_26_03:A_Prolog_Simula:03,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Fernando Sancho-Caparrini},
	title={A {Prolog} Simulator for Deterministic {P} systems with Active Membranes.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{PerezJ:RiVU_TR_26_03:Computing_a_Par:03,
	author={Antonio P{\'e}rez-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Computing a Partial Mapping by a {P} system: Design and Verification},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{PerezJ:RiVU_TR_26_03:Formal_Verifica:03,
	author={Antonio P{\'e}rez-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Formal Verification of a Transition {P} system Generating the Set $2^n+n^2+n
		| n > 1$},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Alhazo:RiVU_TR_26_03:Minimizing_Evol:03,
	author={Artiom Alhazov},
	title={Minimizing Evolution-Communication {P} systems and {EC} {P} automata},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Alhazo:RiVU_TR_26_03:Generating_Clas:03,
	author={Artiom Alhazov},
	title={Generating Classes of Languages by {P} systems and Other Devices},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Besozz:RiVU_TR_26_03:Hierarchies_of:03,
	author={Daniela Besozzi and Giancarlo Mauri and Claudio Zandron},
	title={Hierarchies of Parallel Rewriting {P} systems.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Csuhaj:RiVU_TR_26_03:From_Watson-Cri:03,
	author={Erzsebet Csuhaj-Varj{\'u} and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un and
		Arto Salomaa},
	title={From {W}atson-{C}rick {L Systems} to {D}arwinian {P} systems.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Csuhaj:RiVU_TR_26_03:New_Results_and:03,
	author={Erzsebet Csuhaj-Varj{\'u} and Gyorgy Vaszil},
	title={New Results and Research Directions Concerning {P Automata}, Accepting {P}
		systems with Communication Only.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Bernar:RiVU_TR_26_03:Language_Genera:03,
	author={Francesco Bernardini and Marian Gheorghe},
	title={Language Generating by Means of {P} systems with Active Membranes},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Cioban:RiVU_TR_26_03:Sevilla_Carpets:03,
	author={Gabriel Ciobanu and Gheorghe P{\u a}un and Gheorghe Stefanescu},
	title={Sevilla Carpets Associated with {P} systems.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Arde:RiVU_TR_26_03:Mechanosensitiv:03,
	author={Ioan I. Ardelean and Daniela Besozzi},
	title={Mechanosensitive Channels, a Hot Topic in (Micro)Biology: any Excitement
		for {P} systems?},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Arde:RiVU_TR_26_03:Playing_with_a:03,
	author={Ioan I. Ardelean and Matteo Cavaliere},
	title={Playing with a Probabilistic {P} system Simulator: Mathematical and Biological
		Problems},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Krithi:RiVU_TR_26_03:P_Automata_with:03,
	author={Kamala Krithivasan},
	title={{P} Automata with Tapes},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Pere:RiVU_TR_26_03:Complexity_Clas:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Complexity Classes in Cellular Computing with Membranes},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Pere:RiVU_TR_26_03:Solving_VALIDIT:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Solving {VALIDITY} Problem by Active Membranes with Input},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Pere:RiVU_TR_26_03:Verification_of:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Verification of non-deterministic transition {P} systems solving {SAT} problem},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Cavali:RiVU_TR_26_03:Forbidding_and:03,
	author={Matteo Cavaliere and Natasha Jonoska},
	title={Forbidding and Enforcing in Membrane Computing.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Margen:RiVU_TR_26_03:Can_Hyperbolic:03,
	author={Maurice Margenstern},
	title={Can Hyperbolic Geometry Help Molecular Computing?},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Madhu:RiVU_TR_26_03:New_Results_in:03,
	author={Mutyam Madhu},
	title={New Results in Rewriting {P} systems},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Sosik:RiVU_TR_26_03:Solving_a_PSPAC:03,
	author={Petr Sos{\'i}k},
	title={Solving a {PSPACE}-Complete Problem by {P} systems with Active Membranes},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Ceterc:RiVU_TR_26_03:P_Systems_with:03,
	author={Rodica Ceterchi and Carlos Mart{\'i}n-Vide},
	title={{P} systems with Communication for Static Sorting.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Ceterc:RiVU_TR_26_03:Array-rewriting:03,
	author={Rodica Ceterchi and Mutyam Madhu and Gheorghe P{\u a}un and K.G. Subramanian},
	title={Array-rewriting {P} systems.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Ceterc:RiVU_TR_26_03:Generating_Pict:03,
	author={Rodica Ceterchi and Radu Gramatovici and Natasha Jonoska and K.G. Subramanian},
	title={Generating Picture Languages with {P} systems.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Freund:RiVU_TR_26_03:P_Systems_with:03,
	author={Rudolf Freund and Marion Oswald},
	title={{P} systems with Elementary Graph Productions},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Kris:RiVU_TR_26_03:Three_Universal:03,
	author={Shankara Narayanan Krishna and Andrei P{\u a}un},
	title={Three Universality Results on {P} systems},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Kris:RiVU_TR_26_03:Some_Universali:03,
	author={Shankara Narayanan Krishna and Andrei P{\u a}un},
	title={Some Universality Results on Evolution-Communication {P} systems},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Ji:RiVU_TR_26_03:Towards_a_Unifi:03,
	author={Sungchul Ji},
	title={Towards a Unified Theory of Computing, Mind, and Signs.},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Suzuki:RiVU_TR_26_03:Abstract_Rewrit:03,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={Abstract Rewriting Systems on Multisets and Their Application for Modelling
		Complex Behaviours},
	institution={Rovira i Virgili University},
	year={2003},
	number={26}
}

@techreport{Lepora:DCSAUS_TR_01_04:Simulating_the:04,
	author={Alberto Leporati and Claudio Zandron and Giancarlo Mauri},
	title={Simulating the {Fredkin} {Gate} with Energy--Based {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Cordon:DCSAUS_TR_01_04:Looking_for_P_T:04,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Looking for {P Truth}},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Cordon:DCSAUS_TR_01_04:Weak_Metrics_on:04,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Weak Metrics on Configurations of a {P} system},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Alhazo:DCSAUS_TR_01_04:A_Note_on_P_Sys:04,
	author={Artiom Alhazov},
	title={A Note on {P} systems with Activators},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Alhazo:DCSAUS_TR_01_04:P_Systems_with:04,
	author={Artiom Alhazov and Rudolf Freund and Gheorghe P{\u a}un},
	title={{P} systems with Active Membranes and Two Polarizations},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Alhazo:DCSAUS_TR_01_04:Membrane_Operat:04,
	author={Artiom Alhazov and Tseren-Onolt Ishdorj},
	title={Membrane Operations in {P} systems with Active Membranes},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Besozz:DCSAUS_TR_01_04:Size_and_Power:04,
	author={Daniela Besozzi and Erzsebet Csuhaj-Varj{\'u} and Giancarlo Mauri and Claudio
		Zandron},
	title={Size and Power of Extended Gemmating {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Fontan:DCSAUS_TR_01_04:Maximum_Search:04,
	author={Federico Fontana and Giuditta Franco},
	title={Maximum Search Using {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Sancho:DCSAUS_TR_01_04:A_Note_on_Compl:04,
	author={Fernando Sancho-Caparrini},
	title={A Note on Complexity Measures for Probabilistic {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Bernar:DCSAUS_TR_01_04:Cell_Communicat:04,
	author={Francesco Bernardini and Marian Gheorghe},
	title={Cell Communication in Tissue {P} systems and Cell Division in Population
		{P Systems}},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Cioban:DCSAUS_TR_01_04:Pumps_Systems_o:04,
	author={Gabriel Ciobanu},
	title={Pumps Systems of Membranes},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Paun:DCSAUS_TR_01_04:Further_open_pr:04,
	author={Gheorghe P{\u a}un},
	title={Further open problems in membrane computing},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Paun:DCSAUS_TR_01_04:Tissue_P_System:04,
	author={Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Tissue {P} systems with Cell Division},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Paun:DCSAUS_TR_01_04:P_Systems_with:04,
  author       = {Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
  title        = {{P} systems with Tables of Rules},
  institution  = {Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
  year         = {2004},
  number       = {01/2004},
}

@techreport{Franco:DCSAUS_TR_01_04:Membrane_Kauffm:04,
	author={Giuditta Franco},
	title={{M}embrane {K}auffman {N}etworks},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Arde:DCSAUS_TR_01_04:New_Proposals_f:04,
	author={Ioan I. Ardelean and Daniela Besozzi},
	title={New Proposals for the Formalization of Membrane Proteins},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Arde:DCSAUS_TR_01_04:Computing_Using:04,
	author={Ioan I. Ardelean and Matteo Cavaliere and Dragos Sburlan},
	title={Computing Using Signals: From Cells to {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Nepo:DCSAUS_TR_01_04:A_Java_Simulato:04,
	author={Isabel A. Nepomuceno-Chamorro},
	title={A {Java} Simulator for Basic Transition {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Semp:DCSAUS_TR_01_04:Covering_Rules:04,
	author={Jos{\'e} M. Sempere},
	title={Covering Rules in {P} systems: Some Preliminary Ideas},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Pan:DCSAUS_TR_01_04:Further_Remarks:04,
	author={Linqiang Pan and Artiom Alhazov and Tseren-Onolt Ishdorj},
	title={Further Remarks on {P} systems with Active Membranes, Separation, Merging,
		and Release Rules},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Pan:DCSAUS_TR_01_04:Solving_Multidi:04,
	author={Linqiang Pan and Carlos Mart{\'i}n-Vide},
	title={Solving Multidimensional 0-1 {Knapsack} {Problem} by {P} systems with Input
		and Active Membranes},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Pan:DCSAUS_TR_01_04:P_Systems_with:04,
	author={Linqiang Pan and Tseren-Onolt Ishdorj},
	title={{P} systems with Active Membranes and Separation Rules},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Ledesm:DCSAUS_TR_01_04:A_Tissue_P_Syst:04,
	author={Lucas Ledesma and Daniel Manrique and Alfonso Rodr{\'i}guez-Pat{\'o}n and Andr{\'e}s
		Silva},
	title={A Tissue {P} system and a {DNA} Microfluidic Device for Solving the Shortest
		Common Superstring Problem},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Pere:DCSAUS_TR_01_04:Solving_the_BIN:04,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Francisco Jos{\'e} Romero-Campero},
	title={Solving the {BINPACKING} Problem by Recognizer {P} systems with Active Membranes},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Pere:DCSAUS_TR_01_04:A_CLIPS_Simulat:04,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Francisco Jos{\'e} Romero-Campero},
	title={A {CLIPS} Simulator for Recognizer {P} systems with Active Membranes},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Cavali:DCSAUS_TR_01_04:P_Systems_with:04,
	author={Matteo Cavaliere and Daniela Genova},
	title={{P} systems with Symport/Antiport of Rules},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Guti:DCSAUS_TR_01_04:Towards_a_Progr:04,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Towards a Programming Language in Cellular Computing},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Guti:DCSAUS_TR_01_04:An_Efficient_Ce:04,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={An Efficient Cellular Solution for the Partition Problem},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Guti:DCSAUS_TR_01_04:Deductive_Datab:04,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Vladimir Rogozhin},
	title={Deductive Databases and {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Ionesc:DCSAUS_TR_01_04:On_P_Systems_wi:04,
	author={Mihai Ionescu and Dragos Sburlan},
	title={On {P} systems with Promoters/Inhibitors},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Frisco:DCSAUS_TR_01_04:About_P_Systems:04,
	author={Pierluigi Frisco},
	title={About {P} systems with Symport/Antiport},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Ceterc:DCSAUS_TR_01_04:Simulating_Shuf:04,
	author={Rodica Ceterchi and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Simulating {Shuffle-Exchange} Networks with {P} systems},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Freund:DCSAUS_TR_01_04:Sequential_P_Sy:04,
	author={Rudolf Freund and Alberto Leporati and Marion Oswald and Claudio Zandron},
	title={Sequential {P} systems with Unit Rules and Energy Assigned to Membranes},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Freund:DCSAUS_TR_01_04:P_Systems_with_Active:04,
	author={Rudolf Freund and Andrei P{\u a}un},
	title={{P} systems with Active Membranes and without Polarizations},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Freund:DCSAUS_TR_01_04:Tissue-like_P_S:04,
	author={Rudolf Freund and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Tissue-like {P} systems with Channel-States},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Freund:DCSAUS_TR_01_04:P_Systems_with_Antiport:04,
	author={Rudolf Freund and Marion Oswald},
	title={{P} systems with Antiport Rules for Evolution Rules},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Rogozh:DCSAUS_TR_01_04:Simulation_of_M:04,
	author={Vladimir Rogozhin and Elena Boian},
	title={Simulation of Mobile Ambients by {P} systems. Part 2},
	institution={Dept. of Computer Sciences and Artificial Intelligence, Univ. of Sevilla},
	year={2004},
	number={01/2004}
}

@techreport{Sburlan:RNGC_Report,
	author={Dragos Sburlan},
	title={Membrane systems with promoters/inhibitors. From computational universality
		to algorithms},
	institution={Sevilla University},
	year={2004},
	number={04/2004},
	note={RNGC Report 04/2004}
}

@techreport{Cavaliere:RNGC_Report,
	author={Matteo Cavaliere},
	title={Evolution, communication and observation. From biology to membrane systems
		and back},
	institution={Sevilla University},
	year={2004},
	number={03/2004},
	note={RNGC Report 03/2004}
}

@techreport{Calude_Paun:CDMTCS_R246:Cells_and_atoms_five_years,
	author={Cristian S. Calude and Gheorghe P{\u a}un},
	title={Computing with Cells and Atoms: After Five Years},
	institution={Univ. of Auckland},
	year={2004},
	number={R 246},
	note={CDMTCS Tech. Rep. R 246}
}

@techreport{Korczynski:W2/2003:Transformacje:04,
	author={Waldemar Korczynski},
	title={Transformacje systemow {P}auna jako model przeksztalcen systemowych},
	institution={WSU Kielce},
	year={2004},
	number={W2/2003},
	note={Raport z Badan Grantu W2/2003}
}

@techreport{Cavaliere:Decision,
	author={Matteo Cavaliere and S. Sedwards},
	title={Decision Problems in Membrane Systems with Peripheral Proteins, Transport
		and Evolution},
	institution={Microsoft Research - University of Trento, Centre for Computational and
		Systems Biology},
	year={2006},
	address={Trento, Italy},
	number={12/2006},
	note={Microsoft Research - University of Trento, Centre for Computational and
		Systems Biology}
}

@techreport{Cavaliere:Membrane_Systems:TR_04/2006:2006,
	author={Matteo Cavaliere and S. Sedwards},
	title={Membrane systems with peripheral proteins: transport and evolution},
	institution={Microsoft Research - University of Trento, Centre for Computational and
		Systems Biology},
	year={2006},
	address={Trento, Italy},
	number={04/2006},
	note={Microsoft Research - University of Trento, Centre for Computational and
		Systems Biology}
}

@techreport{Campos:Development:INAOE:2006,
	author={J.M. Campos Diaz and E. Lopez Dominguez and S. Lopez Escobar and J. Estudillo
		Ramirez and L.D. Huerta Hernandez},
	title={Development of a cleaner robot using techniques of membranes},
	institution={Report INAOE},
	year={2006},
	address={Puebla, Mexic},
	note={Report INAOE}
}

@techreport{Paun:Bounding_the_indegree:TUCS_TR_773:2006,
	author={Gh. Paun and M.J. Perez-Jimenez and A. Salomaa},
	title={Bounding the indegree of spiking neural P systems},
	institution={TUCS Technical Report 773},
	year={2006}
}

@techreport{Cavaliere:Asynchronous,
	author={M. Cavaliere and O. Egecioglu and O.H. Ibarra and S. Woodworth and M. Ionescu
		and Gh. Paun},
	title={Asynchronous Spiking Neural {P} Systems Technical Report 9/2007, Microsoft
		Research - University of Trento, Centre for Computational and Systems Biology},
	institution={Microsoft Research � University of Trento},
	year={2007},
	number={9-2007}
}

@techreport{Cavaliere:Colonies_of:TRMR:2007,
	author={M. Cavaliere and R. Mardare and S. Sedwards},
	title={Colonies of Synchronizing Agents Technical Report 11-2007, Microsoft Research
		� University of Trento, Centre for Computational and Systems Biology},
	institution={Microsoft Research � University of Trento},
	year={2007},
	number={11-2007}
}

@phdthesis{Romero-Campero:PhD:2008,
  author       = {Francisco J. Romero-Campero},
  title        = {P systems, a computational modelling framework for systems biology},
  school       = {University of {S}evilla},
  year         = {2008},
  address      = {Sevilla, Spain},
}

@phdthesis{Zandron:PhD:2002,
	author={Claudio Zandron},
	title={A Model for Molecular Computing: Membrane Systems},
	school={Dipartimento di Scienze dell'Informazione, Universita' degli Studi di Milano},
	year={2002},
	address={Milano, Italy}
}

@phdthesis{Sancho-Caparrini:PhD:2002,
	author={Fernando Sancho-Caparrini},
	title={Verification of Programs in Unconventional Computing Models},
	school={University of {S}evilla},
	year={2002},
	address={Sevilla, Spain}
}

@phdthesis{Krishna:PhD:2002,
	author={Shankara-Narayanan Krishna},
	title={Languages of {P Systems}. {C}omputability and Complexity},
	school={Indian Institute of Technology},
	year={2002},
	address={Madras, India}
}

@phdthesis{Romero-Jimenez:PhD:2003,
	author={Alvaro Romero-Jim{\'e}nez},
	title={Complexity and universality in cellular computing models},
	school={Departamento de {C}iencias de la {C}omputaci{\'o}n e {I}nteligencia {A}rtificial.
		{U}niversidad de {S}evilla},
	year={2003},
	address={Sevilla, Spain}
}

@phdthesis{Paun:PhD:2003,
	author={Andrei P{\u a}un},
	title={Unconventional Models of Computation: {DNA} and {M}embrane {C}omputing},
	school={University of Western Ontario},
	year={2003},
	month={May},
	address={London, Ontario, Canada}
}

@phdthesis{Oswald:PhD:2003,
	author={Marion Oswald},
	title={{P Automata}},
	school={Faculty of Computer Science. TU Vienna},
	year={2003},
	month={November},
	address={Vienna, Austria}
}

@phdthesis{Madhu:PhD:2003,
	author={Mutyam Madhu},
	title={Studies of {P Systems} as a model of cellular computing},
	school={Dept. of Computer Science and Engineering, Indian Institute of Technology},
	year={2003},
	address={Madras, India}
}

@phdthesis{Riscos-Nunez:PhD:2004,
	author={Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Cellular Programming: Efficient Resolution of {NP-Complete} Numerical Problems},
	school={Universidad de Sevilla},
	year={2004},
	address={Sevilla, Spain}
}

@phdthesis{Besozzi:PhD:2004,
	author={Daniela Besozzi},
	title={Computational and modelling power of {P systems}},
	school={Universita' degli Studi di Milano},
	year={2004},
	address={Milano, Italy}
}

@phdthesis{Arroyo:PhD:2004,
	author={Fernando Arroyo-Montoro},
	title={Structures and Biolanguage to Simulate Membrane Computing},
	school={Departamento de {I}nteligencia {A}rtificial. {F}acultad de {I}nform{\'a}tica.
		{U}niversidad {P}olit{\'e}cnica de {M}adrid},
	year={2004},
	month={June},
	address={Madrid, Spain}
}

@phdthesis{Lakshmanan:PhD:2004,
  author       = {L. Lakshmanan},
  title        = {On the Crossroads of {P Systems} and Contextual Grammars: Variants, Computability
                  Complexity and Efficiency},
  school       = {Dept. of Mathematics, Indian Institute of Technology},
  year         = {2004},
  address      = {Madras, India},
}

@phdthesis{Frisco:PhD:2004,
	author={Pierluigi Frisco},
	title={Theory of Molecular Computing. {S}plicing and {M}embrane Systems},
	school={Leiden University, The Netherlands},
	year={2004}
}

@phdthesis{Verlan:PhD:2004,
  author       = {Sergey Verlan},
  title        = {Head systems and application to bio-informatics},
  school       = {{LITA}, Universit\'e de Metz},
  year         = {2004},
  address      = {Metz, France},
}

@phdthesis{Bernardini:PhD:2005,
	author={Francesco Bernardini},
	title={Membrane Systems for Molecular Computing and Biological Modelling},
	school={University of Sheffield},
	year={2005},
	address={Sheffield, UK}
}

@phdthesis{Cienciala:PhD:2005,
	author={Ludek Cienciala},
	title={P automata},
	school={University of Ostrava},
	year={2005},
	address={Ostrava, Czech Republic}
}

@phdthesis{Alhazov:PhD:2006,
	author={Artiom Alhazov},
	title={Communication in Membrane Systems with Symbol Objects},
	school={University of Sevilla, Spain},
	year={2006},
	address={Sevilla, Spain}
}

@phdthesis{Popa:PhD:2006,
	author={B. Popa},
	title={Membrane Systems with Limited Parallelism},
	school={College of Engineering and Science, Louisiana Tech University, Ruston, USA},
	year={2006},
	address={Ruston, USA}
}

@phdthesis{Sburlan:PhD:2006,
	author={Dragos Sburlan},
	title={Promoting and Inhibiting Contexts in Membrane Computing},
	school={University of Sevilla},
	year={2006},
	address={Sevilla, Spain}
}

@phdthesis{Cavaliere:PhD:2006,
	author={Mateo Cavaliere},
	title={Evolution, communication, observation: From biology to membrane computing
		and back},
	school={University of Sevilla},
	year={2006},
	address={Sevilla, Spain}
}

@phdthesis{Bianco:PhD:2007,
	author={L. Bianco},
	title={Membrane Models of Biological Systems},
	school={Universita' degli Studi di Verona, Italy},
	year={2007},
	address={Verona, Italy}
}

@phdthesis{Hemalatha:PhD:2007,
	author={S. Hemalatha},
	title={A Study on Rewriting {P} Systems, Splicing Grammar Systems and Picture Array
		Languages},
	school={University of Chennai, India},
	year={2007},
	address={India}
}

@phdthesis{Ishdorj:PhD:2007,
	author={T. O. Ishdorj},
	title={Membrane Computing, Neural Inspiration, Gene Assembly in Ciliates},
	school={Universidad de Sevilla, Spain},
	year={2007},
	address={Sevilla, Spain}
}

@misc{Zandron:Priorities_and_Variable_Thickness:2000,
	author={Claudio Zandron and Claudio Ferretti and Giancarlo Mauri},
	title={Priorities and Variable Thickness of Membranes in Rewriting {P} Systems},
	year={2000}
}

@misc{Freund:Computing_with_Membranes_Three:2000,
	author={Rudolf Freund and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Computing with Membranes: Three More Collapsing Hierarchies},
	year={2000}
}

@misc{Stefan:Chaotic_membrane_computation:2002,
	author={Gheorghe Stefan},
	title={Chaotic membrane computation with cellular automata},
	year={2002}
}

@misc{Cioban:A_Computational:Un,
	author={Gabriel Ciobanu and Vlad Ciubotariu and Bogdan Tanasa},
	title={A Computational Model of Membrane Transportation},
	howpublished={Submitted}
}

@misc{Bel_En:Dynamic_meaning:Un,
	author={Gemma Bel-Enguix and M. Dolores Jim{\'e}nez-L{\'o}pez},
	title={Dynamic meaning membrane systems},
	howpublished={Submitted}
}

@misc{Bel_En:Membrane_system:Un,
	author={Gemma Bel-Enguix and M. Dolores Jim{\'e}nez-L{\'o}pez},
	title={Membrane systems for conversation modeling},
	note={Gemma Bel-Enguix, Introducing Parallelism in Conversation Modeling with
		Membrane Systems (submitted).},
	howpublished={Submitted}
}

@misc{Cavali:Evolutioncomm:Un,
	author={Matteo Cavaliere},
	title={Evolution, communication and observation. From biology to membrane systems
		and back},
	note={RNGC Report 03/2004, Sevilla University.},
	howpublished={Submitted}
}

@misc{Madhu:Rewriting_P_Sys:Un,
	author={Mutyam Madhu},
	title={Rewriting {P} Systems. Collapsing Hierarchies},
	note={Theoretical Computer Science, to appear},
	howpublished={Submitted}
}

@misc{Freund:On_Deterministi:Un,
	author={Rudolf Freund and Gheorghe P{\u a}un},
	title={On Deterministic {P Systems}},
	howpublished={Submitted}
}

@misc{Qi:The_P_system_ba:Un,
	author={Zhengwei Qi and Jinyuan You and Ying Jin and Hongyan Mao},
	title={The {P System} based transaction model for mobile computing},
	howpublished={Submitted}
}

@misc{Botton:Membrane_System:00,
	author={Paolo Bottoni and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un and Grzegorz
		Rozenberg},
	title={Membrane Systems with Promoters/Inhibitors.},
	year={2000},
	howpublished={Submitted}
}

@misc{Krishna:On_Simple_P_Sys:00,
	author={Shankara Narayanan Krishna and Raghavan Rama},
	title={On Simple {P Systems} with External Output},
	year={2000},
	howpublished={Submitted}
}

@misc{Obtulo:Note_on_some_re:01,
	author={Adam Obtulowicz},
	title={Note on some recursive family of {P Systems} with active membranes},
	year={2001},
	howpublished={Submitted}
}

@misc{Rodrig:Computing_with_:01,
	author={Alfonso Rodriguez-Pat{\'o}n},
	title={Computing with Membranes: {P Systems} with {DNA-Worms}},
	note={GECCO, 2001 (poster)},
	year={2001},
	howpublished={GECCO, 2001 (poster)}
}

@misc{Paun:On_the_reachabi:01,
	author={Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={On the reachability problem for {P Systems} with porters},
	note={Proc. AFL10, Debrecen, 2002},
	year={2001},
	howpublished={Submitted}
}

@misc{Subr:A_note_on_self_:01,
	author={K.G. Subramanian and D.G. Thomas and M.H. Begum and P.H. Chandra},
	title={A note on self crossover and splicing {P Systems}},
	note={Pre-Proceedings of WMC 2001 (No est{\'a} en los proceedings: Fundamenta Informaticae
		49)},
	year={2001}
}

@misc{Krishna:Time-Varying_an:01,
	author={Shankara Narayanan Krishna and Raghavan Rama},
	title={Time-Varying and Null Parallel {P Systems}},
	note={No aparece},
	year={2001},
	howpublished={No aparece}
}

@misc{Ciobanu:Distributed_com:02,
	author={Gabriel Ciobanu},
	title={Distributed computing in {P Systems} with antiport communication},
	year={2002},
	howpublished={Submitted}
}

@misc{Madhu:A_Note_on_P_Sys:02,
	author={Mutyam Madhu},
	title={A Note on {P Systems} with Replicated Rewriting},
	year={2002},
	howpublished={Submitted}
}

@misc{Madhu_:Hybrid_P_System:02,
	author={Mutyam Madhu and Kamala Krithivasan},
	title={Hybrid {P Systems}: Improved Universality Results},
	note={Poster in Unconventional Models of Computation, UMC-02, Himeji, Japan, October
		15-19, 2002},
	year={2002},
	month={October 15-19},
	howpublished={Poster in Unconventional Models of Computation, UMC-02, Himeji, Japan, October
		15-19, 2002}
}

@misc{Madhu:Hardware_Realiz:02,
	author={Mutyam Madhu and Vadali S. Murty and Kamala Krithivasan},
	title={Hardware Realization of {P Systems} with Carriers},
	note={Poster presentation in the Eighth International Conference on DNA based
		Computers, Hokkaido University, Sapporo Campus, Japan, June 10-13, 2002},
	year={2002},
	month={June},
	howpublished={Poster presentation in the Eighth International Conference on DNA based
		Computers, Hokkaido University, Sapporo Campus, Japan, June 10-13, 2002}
}

@article{Sosik:The_power_of_ca:02,
  author       = {Petr Sos{\'i}k},
  title        = {The power of catalysts and priorities in membranes},
  journal      = {Grammars},
  year         = {2003},
  volume       = {6},
  pages        = {13--24},
}

@misc{Krishna:Infinite_hierar:02,
	author={Shankara Narayanan Krishna},
	title={Infinite hierarchies on some variants of {P Systems}},
	year={2002},
	howpublished={Submitted}
}

@misc{Ji:Towards_the_mod:Un,
	author={Sungchul Ji and Gabriel Ciobanu},
	title={Towards the modeling of cell communication and computation using the shape
		algebra of biopolymers},
	note={psystems.disco.unimib.it},
	year={2002},
	howpublished={psystems.disco.unimib.it}
}

@misc{Syropo:Fuzzyfying_P_Sy:Un,
	author={A. Syropoulos},
	title={Fuzzyfying {P Systems}},
	year={2003},
	howpublished={Submitted}
}

@misc{Obtulo:New_mathematica:Un,
	author={Adam Obtulowicz},
	title={New mathematical foundations of membrane computing; Attacking {NP} complete
		problems revisited},
	year={2003},
	howpublished={Submitted}
}

@misc{PerezJ:Computing_a_par:01,
	author={Antonio Perez-Jimenez and Mario J. Perez-Jimenez and Fernando Sancho-Caparrini},
	title={Computing a partial mapping by {P Systems}: Design and verification},
	note={M. Cavaliere, C. Mart{\'i}n-Vide, Gh. Paun (Eds), Brainstorming Week on Membrane
		Computing; Tarragona, Feb 5-11 2003, 247-260},
	year={2003}
}

@misc{Lakshm:Computational_U:Un,
	author={K. Lakshmanan},
	title={Computational Universality and Solving {NP} Complete Problems using Insertion
		Deletion Tissue {P Systems}},
	year={2003},
	howpublished={Submitted}
}

@misc{Verlan:2MOLCONET:2003,
	author={Sergei Verlan},
	title={Communicating Distributed H Systems with Alternating Filters and Tissue
		P Systems with Minimal Symport/Antiport},
	note={EMCC Workshop - 2nd Annual MolCoNet Meeting November 27-29, 2003 Wien, Austria},
	year={2003}
}

@misc{Cordon-Franco:Cellular,
  author       = {A. Cordon-Franco and M.A. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez and A.
                  Riscos-Nunez},
  title        = {Cellular solutions to some numerical NP-complete problems. A Prolog implementation
                  Molecular Computational Models},
  note         = {Idea-Group, London 2004, 115--149},
  year         = {2004},
  howpublished = {Unconventional Approaches (M. Gheorghe, ed.)},
}

@misc{Binder:Implem_of_Catalytic:Subm04,
	author={Aneta Binder and Rudolf Freund and Georg Lojka and Marion Oswald},
	title={Implementation of catalytic {P Systems}},
	note={CIAA 2004, Ninth Intern. Conf. on Implementation and Application of Automata,
		Kingston, Canada, 2004, 24--33},
	year={2004},
	howpublished={Submitted}
}

@misc{DiNola:Handling_Imprecision:04,
	author={Antonio Di-Nola and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Francesc
		Rossell{\'o}},
	title={(Imprecise Topic About) {H}andling Imprecision in {P Systems}},
	year={2004},
	howpublished={Submitted}
}

@misc{Sburlan:Bull:2004,
	author={D. Sburlan},
	title={New Results on {P} systems with multiset promoted/inhibited rules},
	note={pages 45--54},
	year={2004},
	howpublished={Bull. PAMM, 2164}
}

@misc{Bertinshaw:algorithmic_learning:04,
	author={Daniel Bertinshaw},
	title={Algorithmic learning applications to {P Systems}},
	year={2004},
	howpublished={Submitted}
}

@misc{Besozzi:Dynamical_prob:Subm04,
	author={Daniela Besozzi and Claudio Zandron},
	title={Dynamical probabilistic {P Systems}},
	note={¿DNA10 poster?},
	year={2004},
	howpublished={Submitted}
}

@misc{Csuhaj:PC_grammar_systems:Subm04,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gheorghe P{\u a}un and Gyorgy Vaszil},
	title={Grammar systems vs. membrane computing: The case of {PC} grammar systems},
	year={2004},
	howpublished={Submitted}
}

@misc{Csuhaj:CD_grammar_systems:Subm04,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gheorghe P{\u a}un and Gyorgy Vaszil},
	title={Grammar systems vs. membrane computing: The case of {CD} grammar systems},
	year={2004},
	howpublished={Submitted}
}

@misc{CsuhajVarju:On_The_Comp:Subm04,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Oscar H. Ibarra and Gyorgy Vaszil},
	title={On the computational complexity of {P automata}},
	note={DNA 10},
	year={2004},
	howpublished={Submitted}
}

@misc{Bel:Linguistic_membrane:Subm04,
  author       = {Gemma Bel-Enguix and M. Dolores Jim{\'e}nez-L{\'o}pez},
  title        = {Linguistic membrane systems and applications},
  note         = {Gemma Bel-Enguix and M. Dolores Jim{\'e}nez-L{\'o}pez, Linguistic membrane systems
                  and applications, in G. Ciobanu and Gh. P{\u a}un and M.J. P{\'e}rez-Jim{\'e}nez (eds.)
                  Applications of Membrane Computing, Berlin, Springer-Verlag (in press).},
  year         = {2004},
  howpublished = {Submitted},
}

@misc{Paun:P_Systems_on_Gr:Un,
	author={Gheorghe P{\u a}un and Yasubumi Sakakibara and Takashi Yokomori},
	title={{P Systems} on Graphs of Restricted Forms},
	note={Publicationes Mathematicae Debrecen, to appear},
	year={2004},
	howpublished={Publicationes Mathematicae Debrecen, to appear}
}

@misc{Bianco:P_,
	author={Luca Bianco and Federico Fontana and Giuditta Franco and Vincenzo Manca},
	title={{P Systems} in bio systems},
	note={in G. Paun, P systems: Applications and Perspectives, to appear, 2004},
	year={2004},
	howpublished={Submitted}
}

@misc{PerezJimenez:Hard_Problems:04,
	author={M.J. Perez-Jimenez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Hard problems addressed through {P Systems}},
	year={2004},
	howpublished={Submitted}
}

@misc{Cavaliere:Modelling_respiration:Subm04,
	author={Matteo Cavaliere and Ioan I. Ardelean},
	title={Modelling respiration in bacteria and respiration/photosynthesis interaction
		in Cyanobacteria by using a {P System} simulator},
	year={2004},
	howpublished={Submitted}
}

@misc{Cavaliere:time_free_P_Systems:04,
	author={Matteo Cavaliere and Vincenzo Deufemia},
	title={On time-free {P Systems}},
	year={2004},
	howpublished={Submitted}
}

@misc{Madhu:leftmost_rewriting:04,
	author={Mutyam Madhu and Kamala Krithivasan},
	title={Tissue {P Systems} with leftmost rewriting},
	year={2004},
	howpublished={Submitted}
}

@misc{Ibarra:Determinism_Versus_Nondeterminism:04,
	author={Oscar H. Ibarra},
	title={On Determinism Versus Nondeterminism in {P Systems}},
	year={2004},
	howpublished={Submitted}
}

@misc{Ibarra:maximal_parallelism_in_P:Subm04,
	author={Oscar H. Ibarra and H.-C. Yen and Zhe Dang},
	title={The power of maximal parallelism in {P Systems}},
	note={To appear in Proceedings of DLT'04 Lecture Notes in Computer Science, Springer.
		2004.},
	year={2004},
	howpublished={Submitted}
}

@misc{Freund:Asynchronous_P_systems_on:Subm04,
	author={Rudolf Freund},
	title={Asynchronous {P Systems} on arrays and strings},
	note={DLT'04 - Eighth International Conference on Developments in Language Theory.
		To appear in Proceedings of DLT'04 Lecture Notes in Computer Science, Springer.
		2004.},
	year={2004},
	howpublished={Submitted}
}

@misc{Freund:Dynamic_Channels_2004,
	author={Rudolf Freund and Marion Oswald},
	title={P systems with dynamic channels transporting membrane vesicles},
	year={2004},
	howpublished={Submitted}
}

@misc{Verlan:Tissue_with_minimal:Subm04,
	author={Sergey Verlan},
	title={Tissue {P Systems} with minimal symport/antiport},
	note={DLT'04 - Eighth International Conference on Developments in Language Theory,
		Auckland, New Zealand - December 13-17 2004},
	year={2004}
}

@misc{Krishna:Mobile_membranes:04,
	author={Shankara Narayanan Krishna and Gheorghe P{\u a}un},
	title={{P Systems} with mobile membranes},
	year={2004},
	howpublished={Submitted}
}

@misc{Ishdorj:Replicative_distribution_rules:Subm04,
	author={Tseren Onolt Ishdorj and Mihai Ionescu},
	title={Replicative-distribution rules in {P Systems} with active membranes},
	note={First International Colloquium on THEORETICAL ASPECTS OF COMPUTING Guiyang,
		China 20 - 24 September 2004},
	year={2004},
	howpublished={Submitted}
}

@misc{Korczynski:tool_to_deal_concurrency:Subm04,
	author={Waldemar Korczynski},
	title={{P Systems} as a tool to deal with concurrency in accounting},
	year={2004},
	howpublished={Submitted}
}

@misc{Suzuki:Toward_a_novel:Subm04,
	author={Yasuhiro Suzuki and Daniela Besozzi and Claudio Zandron and Hiroshi Tanaka
		and Giancarlo Mauri},
	title={Toward a novel computational framework for molecular computing: chemical
		reaction as computation},
	note={DNA10, Milano, 2004},
	year={2004},
	howpublished={Submitted}
}

@misc{Apostolos:Generalized_fuzzy:2005,
	author={A. Apostolos},
	title={Generalized fuzzy multisets and {P} systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Apaun:P,
	author={A. Paun and B. Popa},
	title={P systems with proteins on membranes},
	year={2005},
	howpublished={Submitted}
}

@misc{Porreca:Complexity,
	author={A. Porreca and G. Mauri and C. Zandron},
	title={Complexity Classes for Membrane Systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Rodriguez:characterize,
  author       = {A. Rodriguez-Paton and P. Sosik},
  title        = {P systems with active membranes characterize {PSPACE}},
  booktitle    = {DNA Computing, 12th Int. Meeting on DNA Computing, DNA 12},
  year         = {2006},
  publisher    = {Springer-Verlag, Berlin},
  address      = {Seoul, Korea},
  editor       = {C. Mao, T. Yokomori},
  pages        = {33--46},
  abstract     = {A P system is a natural computing model inspired by information
                  processes in cells and a control role of cellular membranes. We show that uniform families of P systems with active membranes are able to solve, in polynomial time, exactly the class of decisional problems {PSPACE}. Similar results were achieved also with other models of bio-inspired computers, such as DNA computing. Together they suggest that {PSPACE} naturally characterizes the computational potential of biological information processing.},
  series       = {Lecture Notes in Computer Science},
  volume       = {4287},
}

@misc{Bonchis:UC05:2005,
	author={C. Bonchis and G. Ciobanu and C. Isbasha and D. Petcu},
	title={A web-based P system simulator and its parallelization},
	year={2005},
	howpublished={UC05, accepted}
}

@misc{Graciani:UC05:2005,
	author={C. Graciani and A. Riscos-Nunez},
	title={Looking for simple common schemes to design recognizer P systems with active
		membranes that solve numerical decision problems},
	year={2005},
	howpublished={UC05, accepted}
}

@misc{Csuhaj:Editing_Configurations:2005,
	author={Erzsebet Csuhaj-Varju and Antonio Di Nola and Gheorghe P{\u a}un and Mario
		Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Gy{\"o}rgy Vaszil},
	title={Editing configurations of {P} systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Bernardini:Quorum,
	author={F. Bernardini and M. Gheorghe and N. Krasnogor},
	title={Quorum sensing P systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Bernardini:UC05:2005,
	author={F. Bernardini and M. Gheorghe and N. Krasnogor and J.-L. Giavitto},
	title={On self-assembly in population P systems},
	year={2005},
	howpublished={UC05, accepted}
}

@misc{Ciobanu:The,
	author={G. Ciobanu and Gheorghe P{\u a}un},
	title={The minimal parallelism is still universal (for P systems with symport/antiport
		rules)},
	year={2005}
}

@misc{Paun:MC_Power_Efficiency_applications:2005,
	author={Gheorghe P{\u a}un},
	title={Membrane computing: Power, efficiency, applications},
	year={2005},
	howpublished={Submitted}
}

@misc{Paun:Brief,
	author={Gheorghe P{\u a}un and M.J. Perez-Jimenez},
	title={Membrane computing: Brief introduction, recent results and applications},
	year={2005},
	howpublished={Submitted}
}

@misc{Paun:Infinite,
	author={Gheorghe P{\u a}un and M.J. Perez-Jimenez and G. Rozenberg},
	title={Infinite spike trains in spiking neural P systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Paun:Spike,
	author={Gheorghe P{\u a}un and M.J. Perez-Jimenez and G. Rozenberg},
	title={Spike trains in spiking neural P systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Paun:MC_and_Economics:submitted:2005,
	author={Gheorghe P{\u a}un and R. Paun},
	title={Membrane Computing and Economics: Numerical P Systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Paun:Mcas_a_framework:2005,
	author={Gheorghe P{\u a}un and R. Paun},
	title={Membrane computing as a framework for modeling economic processes},
	year={2005},
	howpublished={Submitted}
}

@misc{Cardona:Handling,
	author={M. Cardona and M. Angels Colomer and M.J. Perez-Jimenez and A. Zaragoza},
	title={Handling Markov chains with membrane computing},
	year={2005},
	howpublished={Submitted}
}

@misc{Cavaliere:external,
	author={M. Cavaliere and A. Riscos-Nunez and G. Rozenberg and D. Sburlan},
	title={Membrane systems with external control},
	year={2005},
	howpublished={Submitted}
}

@misc{Cavaliere:marked,
	author={M. Cavaliere and A. Riscos-Nunez and R. Brijder and G. Rozenberg},
	title={Membrane systems with marked membranes},
	year={2005},
	howpublished={Submitted}
}

@misc{Gheorghe:self-assembly:submitted:2005,
	author={M. Gheorghe and Gheorghe P{\u a}un},
	title={Computing by self-assembly: DNA molecules, polyominoes, cells},
	year={2005},
	howpublished={Submitted}
}

@misc{Gutierrez-Naranjo:UC05:2005,
  author       = {M. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez},
  title        = {P systems with active membranes, without polarizations and without dissolution:
                  a characterization of P},
  year         = {2005},
  howpublished = {UC05, accepted},
}

@misc{Ionescu:Spiking,
	author={M. Ionescu and Gheorghe P{\u a}un and T. Yokomori},
	title={Spiking neural-like P systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Perez-Jimenez:ECAL:2005,
	author={M.J. Perez-Jimenez and F.J. Romero-Campero},
	title={Modelling Vibrio fischeri's behaviour Using P Systems},
	year={2005},
	month={September},
	howpublished={accepted in the Systems Biology Workshop, ECAL 2005}
}

@misc{Perez:Modelling_EFGR:2005,
	author={Mario J. P{\'e}rez-Jimenez and Francisco Jos{\'e} Romero-Campero},
	title={Modelling EGFR signalling network using continuous membrane systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Ibarra:context-sensitive,
	author={O.H. Ibarra and Gheorghe P{\u a}un},
	title={Characterizations of context-sensitive languages and other language classes
		in terms of symport/antiport P systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Ibarra:On,
	author={O.H. Ibarra and H.-C. Yen},
	title={On deterministic catalytic P systems},
	year={2005},
	howpublished={Submitted}
}

@misc{Brijder:Communication,
	author={R. Brijder and G. Rozenberg and M. Cavaliere and A. Riscos-Nunez and D. Sburlan},
	title={Communication membrane systems with active symports},
	year={2005},
	howpublished={Submitted}
}

@misc{R_Paun:Producers_retailers:manuscript:2005,
	author={R. Paun},
	title={Producers, retailers, and their investments. A membrane computing approach},
	year={2005},
	howpublished={manuscript}
}

@misc{Freund:Tissue_P_Sys_Symp_Ant_are_universal:2005,
	author={Rudolf Freund and Marion Oswald},
	title={Tissue P systems with symport/antiport rules of one symbol are computationally
		universal},
	year={2005},
	howpublished={Submitted}
}

@misc{Dang:UC05:2005,
	author={Z. Dang and O.H. Ibarra and C. Li and G. Xie},
	title={On model-checking of P systems},
	year={2005},
	howpublished={UC05, accepted}
}

@misc{Alhazov:Membrane_division:Submitted:2006,
	author={A. Alhazov and R. Freund and A. Riscos-Nunez},
	title={Membrane division, restricted membrane creation and object complexity in
		P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Apaun:ewriting,
	author={A. Paun and B. Popa},
	title={Rewriting P systems with communication by symport rules},
	year={2006},
	howpublished={Submitted}
}

@misc{Apaun:Small_universal:Submitted:2006,
	author={A. Paun and Gheorghe P{\u a}un},
	title={Small universal spiking neural P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{GhPaun:Manuscript:2006,
	author={Gheorghe P{\u a}un},
	title={2006 Research topics in membrane computing},
	year={2006},
	howpublished={Nanuscript}
}

@misc{Chen:Spiking_neural:Submitted:2006,
	author={H. Chen and Gheorghe P{\u a}un and M.J. Perez-Jimenez},
	title={Spiking neural P systems with extended rules},
	year={2006},
	howpublished={Submitted}
}

@misc{Chen:Trace_languages:Submitted:2006,
	author={H. Chen and M. Ionescu and A. Paun and Gheorghe P{\u a}un and B. Popa},
	title={On trace languages generated by spiking neural P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Chen:String_languages:Submitted:2006,
	author={H. Chen and R. Freund and M. Ionescu and Gheorghe P{\u a}un and M.J. Perez-Jimenez},
	title={On string languages generated by spiking neural P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Kleijn:Process_semantics:Submitted:2006,
	author={J. Kleijn and M. Koutny and G. Rozenberg},
	title={Process semantics for membrane systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Bianco:Computation_of_biochemical:2006,
	author={L. Bianco and F. Fontana and V. Manca},
	title={Computation of biochemical dynamics using MP systems},
	year={2006},
	howpublished={Computational Methods in Systems Biology, International Conference (poster)}
}

@misc{GutierrezNaranjo:Manuscript:2006,
  author       = {M.A. Guti{\'e}rrez-Naranjo},
  title        = {Fractals and P systems},
  year         = {2006},
  howpublished = {Manuscript},
}

@misc{Busi:Decidability:Submitted:2006,
	author={N. Busi},
	title={Decidability of divergence for catalytic P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Ibarra:Normal_forms:Submitted:2006,
	author={O.H. Ibarra and A. Paun and Gheorghe P{\u a}un and A. Rodriguez-Paton and
		P. Sosik and S.Woodworth},
	title={Normal forms for spiking neural P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Frisco:Dynamics_of_HIV:2006,
	author={P. Frisco and D. W. Corne},
	title={Dynamics of HIV infection studied with Cellular Automata and Conformon-P
		systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Krishna:Combining:Submitted:2006,
	author={S. Krishna},
	title={Combining brane calculus and membrane computing},
	year={2006},
	howpublished={Submitted}
}

@misc{Ishdorj:Minimal,
	author={T.-O. Ishdorj},
	title={Minimal parallelism for polarizationless P systems},
	year={2006},
	howpublished={Submitted}
}

@misc{Dang:Decidability:Submitted:2006,
	author={Z. Dang and O.H. Ibarra and C. Li},
	title={Decidability of model-checking P systems},
	year={2006},
	howpublished={Submitted}
}

@mastersthesis{Besozzi:Master:2000,
	author={Daniela Besozzi},
	title={{P Systems} with Gemmation},
	school={Universita' degli Studi di Milano},
	year={2000}
}

@mastersthesis{Prakash:Master:2001,
	author={Peranandam Prakash-Mohan},
	title={Computing with membranes},
	school={TU Dresden, Fakultat Informatik},
	year={2001},
	month={April}
}

@mastersthesis{Domine:Master:2001,
	author={Richard Domine},
	title={Theorem proving using membrane computing},
	school={Dresden University},
	year={2001}
}

@mastersthesis{Buzzi:Master:2003,
	author={Mara Buzzi},
	title={Calcolo con membrane. {P Sistemi} probabilistici},
	school={Univ. of Como},
	year={2003}
}

@inproceedings{Alhazov:WMC5:minimal_cooperation:LNCS:2005,
	author={Artiom Alhazov and Maurice Margenstern and Vladimir Rogozhin and Yurii Rogozhin
		and Sergey Verlan},
	title={Communicative {P} systems with minimal cooperation},
	booktitle={International Workshop WMC5, Milano, Italy, 2004, LNCS, Springer, 2005 (TO
		APPEAR)},
	editor={Giancarlo Mauri and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Grzegorz
		Rozenberg and Arto Salomaa}
}

@inproceedings{Gutuleac:Descriptive,
	author={E. Gutuleac},
	title={Descriptive times membrane Petri nets for modelling of parallel computing},
	booktitle={Proc. of ICCCC 2006, Oradea, Romania, June 2006},
	pages={256--261}
}

@inproceedings{Ciobanu:A,
	author={G. Ciobanu},
	title={A programming perspective of the membrane computing},
	booktitle={Proc. of ICCCC 2006, Oradea, Romania, June 2006},
	pages={13--22}
}

@inproceedings{Cavaliere:Modelling_Cellular_Processes:LNBI:,
	author={M. Cavaliere and S. Sedwards},
	title={Modelling Cellular Processes using Membrane Systems with Peripheral and
		Integral Proteins},
	booktitle={Fourth International Conference on Computational Methods in Systems Biology,
		CMSB2006},
	publisher={Springer-Verlag},
	series={Lecture Notes In Bioinformatics}
}

@inproceedings{Gontineac:Mealy,
	author={M. Gontineac},
	title={Mealy membrane automata: an automata-like approach to membrane computing},
	booktitle={Proc. of ICCCC 2006, Oradea, Romania, June 2006},
	pages={222--227}
}

@inproceedings{Cavaliere:WMC5:Time_Independent_P_S:LNCS:2005,
	author={Matteo Cavaliere and Dragos Sburlan},
	title={Time-independent {P} systems},
	booktitle={Membrane Computing. International Workshop WMC5, Milano, Italy, 2004 (TO
		APPEAR)},
	editor={Giancarlo Mauri and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Grzegorz
		Rozenberg and Arto Salomaa}
}

@inproceedings{Krishna:WMC5:traces,
	author={Shankara-Narayanan Krishna},
	title={{P} systems with symport/antiport: The traces of {RBCs}},
	booktitle={Membrane Computing. International Workshop WMC5, Milano, Italy, 2004, LNCS,
		Springer, 2005 (TO APPEAR)},
	editor={Giancarlo Mauri and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Grzegorz
		Rozenberg and Arto Salomaa}
}

@inproceedings{Manca:PreWMP:Monoidal_Systems_and:U,
	author={Vincenzo Manca},
	title={Monoidal Systems and Membrane Systems},
	booktitle={Pre-proceedings of Workshop on Multiset Processing},
	address={Curtea de Arges, Romania}
}

@inproceedings{Manca:WMC5:Evolution_Oscilation:LNCS:2005,
	author={Vincenzo Manca and Luca Bianco and Federico Fontana},
	title={Evolution and oscillation in {P} systems: Applications to biological phenomena},
	booktitle={Membrane Computing, International Workshop, WMC5, Milano, Italy, 2004, Selected
		Papers (G. Mauri, Gh. Paun, M.J. Perez-Jimenez, G. Rozenberg, A. Salomaa,
		eds.), LNCS, Springer-Verlag, Berlin, 2005, to appear},
	editor={Giancarlo Mauri and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Grzegorz
		Rozenberg and Arto Salomaa}
}

@inproceedings{Paun:WIA99:Multiset_Processing_:99,
	author={Gheorghe P{\u a}un and Gabriel Thierrin},
	title={Multiset Processing by Means of Systems of Finite State Transducers},
	booktitle={Pre-Proceedings of Workshop on Implementing Automata WIA99},
	year={1999},
	month={August},
	address={Potsdam}
}

@inproceedings{Paun:PreIM_DNA1999:Membrane_Computing_B:99,
	author={Gheorghe P{\u a}un and Takashi Yokomori},
	title={Membrane Computing Based on Splicing},
	booktitle={Preliminary Proceedings of Fifth International Meeting on DNA Based Computers},
	year={1999},
	month={June},
	editor={E. Winfree and D. Gifford},
	pages={213--227},
	organization={MIT}
}

@inproceedings{Petre:FCT99:Mobile_Ambients_and_:99,
	author={Ion Petre and Luigia Petre},
	title={Mobile Ambients and {P} systems},
	booktitle={Workshop on Formal Languages, FCT99, Iasi},
	year={1999}
}

@inproceedings{Freund:FCT99:Generalized_P_Systems_With:99,
	author={Rudolf Freund},
	title={Generalized {P} systems with Splicing and Cutting/Recombination},
	booktitle={Workshop on Formal Languages, FCT99, Iasi},
	year={1999}
}

@inproceedings{Freund:FCT99:Generalized_P_System:99,
	author={Rudolf Freund},
	title={Generalized {P} systems},
	booktitle={Fundamentals of Computation Theory, FCT'99, Iasi, 1999},
	year={1999},
	publisher={Springer-Verlag},
	address={Berlin},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un},
	pages={281--292},
	series={Lecture Notes in Computer Science},
	volume={1684?}
}

@inproceedings{Paun:UMC2000:On_P_Systems_with_Ac:00,
	author={Andrei Paun},
	title={On {P} systems with Active Membranes},
	booktitle={Unconventional Models of Computation},
	year={2000},
	month={February},
	publisher={Springer-Verlag},
	address={London},
	editor={I. Antoniou and Cristian Calude and M.J. Dinneen},
	pages={187--201},
	note={Contributed paper}
}

@inproceedings{Martin:ASFLCW2000:String-Objects_in_P_:00,
	author={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={String-Objects in {P} systems},
	booktitle={Proc. of Algebraic Systems, Formal Languages and Computations Workshop},
	year={2000},
	address={Kyoto},
	pages={161--169},
	organization={RIMS Kokyuroku, Kyoto Univ.}
}

@inproceedings{Martin:UMC2000:P_Systems_with_Valua:00,
	author={Carlos Mart{\'i}n-Vide and Victor Mitrana},
	title={{P} systems with Valuations},
	booktitle={Unconventional Models of Computation},
	year={2000},
	month={February},
	publisher={Springer-Verlag},
	address={London},
	editor={I. Antoniou and Cristian Calude and M.J. Dinneen},
	pages={154--166},
	note={Contributed paper}
}

@inproceedings{Zandron:UMC2000:Solving_NP-Complete_:00,
	author={Claudio Zandron and Claudio Ferretti and Giancarlo Mauri},
	title={Solving {NP}-Complete Problems Using {P} systems with Active Membranes},
	booktitle={Unconventional Models of Computation},
	year={2000},
	month={February},
	publisher={Springer-Verlag},
	address={London},
	editor={I. Antoniou and Cristian Calude and M.J. Dinneen},
	pages={289--301},
	note={Contributed paper}
}

@inproceedings{Zandron:WGS2000:Universality_and_Nor:00,
	author={Claudio Zandron and Giancarlo Mauri and Claudio Ferretti},
	title={Universality and Normal Forms on Membrane Systems},
	booktitle={Proc. Intern. Workshop Grammar Systems 2000},
	year={2000},
	month={July},
	address={Bad Ischl, Austria},
	editor={Rudolf Freund and Alica Kelemenova},
	pages={61--74}
}

@inproceedings{Paun:UMC2000:Computing_with_Membr:00,
	author={Gheorghe P{\u a}un},
	title={Computing with Membranes: Attacking {NP}-Complete Problems},
	booktitle={Unconventional Models of Computation},
	year={2000},
	month={February},
	publisher={Springer-Verlag},
	address={London},
	editor={I. Antoniou and Cristian Calude and M.J. Dinneen},
	pages={94--115},
	note={Invited paper}
}

@inproceedings{Paun:WNCP2000:On_the_Generative_Po:00,
	author={Gheorghe P{\u a}un},
	title={On the Generative Power of {P} systems},
	booktitle={Theorietag 2000. Workshop on New Computing Paradigms},
	year={2000},
	editor={Rudolf Freund},
	pages={59--78},
	organization={TU University Vienna}
}

@inproceedings{Paun:WGS2000:From_Cells_to_Comput:00,
	author={Gheorghe P{\u a}un},
	title={From Cells to Computers: Computing with Membranes ({P} systems)},
	booktitle={Proc. Intern. Workshop Grammar Systems 2000},
	year={2000},
	month={July},
	address={Bad Ischl, Austria},
	editor={Rudolf Freund and Alica Kelemenova},
	pages={9--40}
}

@inproceedings{Castel:SPIRE_2000:P_Systems_with_Worm-:00,
	author={Juan Castellanos and Gheorghe P{\u a}un and Alfonso Rodr{\'i}guez-Pat{\'o}n},
	title={{P} systems with Worm-Objects},
	booktitle={Proceedings of the Seventh International Symposium on String Processing
		Information Retrieval (SPIRE'00)},
	year={2000},
	month={September},
	publisher={IEEE Computer Society},
	address={A Coru{\~n}a, Spain},
	pages={64--74},
	abstract={We consider a combination of P systems with objects described by symbols
		with P systems with objects described by strings. Namely, we work with
		multisets of strings and consider as the result of a computation the number
		of strings in a given output membrane. The strings (also called worms)
		are processed by replication, splitting, mutation, and recombination; no
		priority among rules and no other ingredient is used. In these circumstances,
		it is proved that: (1) P systems of this type can generate all recursively
		enumerable sets of numbers; and moreover, (2) the Hamiltonian Path Problem
		in a directed graph can be solved in quadratic time, while the SAT problem
		can be solved in linear time. The interest of the latter result comes from
		the fact that it is the first time that a polynomial solution to an NP-complete
		problem has been obtained in the P system framework without making use
		of the (non-realistic) operation of membrane division.}
}

@inproceedings{Kudlek:PreWMP:Toward_FMT_(Formal_M:U,
	author={Manfred Kudlek and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Toward {FMT} (Formal Macroset Theory)},
	booktitle={Pre-Proceedings Workshop on Multiset Processing},
	year={2000},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Malita:PreWMP:Membrane_Computing_i:U,
	author={Mihaela Malita},
	title={Membrane Computing in {Prolog}},
	booktitle={Pre-Proceedings Workshop on Multiset Processing},
	year={2000},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Frisco:PreWMP:Membrane_Computing_B:U,
	author={Pierluigi Frisco},
	title={Membrane Computing Based on Splicing: Improvements},
	booktitle={Pre-Proceedings Workshop on Multiset Processing},
	year={2000},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Rama:PreWMP:Computing_with_P_Sys:U,
	author={Raghavan Rama},
	title={Computing with {P} systems},
	booktitle={Pre-Proceedings Workshop on Multiset Processing},
	year={2000},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Freund:WNCP2000:Sequential_P_Systems:00,
	author={Rudolf Freund},
	title={Sequential {P} systems},
	booktitle={Theorietag 2000. Workshop on New Computing Paradigms},
	year={2000},
	editor={Rudolf Freund},
	pages={177--183},
	organization={TU University Vienna}
}

@inproceedings{Freund:DNA62000:Molecular_Computing_:00,
	author={Rudolf Freund and Franziska Freund},
	title={Molecular Computing with Generalized Homogeneous {P} systems},
	booktitle={Proc. Conf. DNA6},
	year={2000},
	address={Leiden},
	editor={Anne Condon and Grzegorz Rozenberg},
	pages={113--125}
}

@inproceedings{NKri:PreWMP:Computing_with_Simpl:U,
	author={Shankara-Narayanan Krishna},
	title={Computing with Simple {P} systems},
	booktitle={Pre-Proceedings Workshop on Multiset Processing},
	year={2000},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Suzuki:PreWMP:Artificial_Life_and_:U,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={Artificial Life and {P} systems},
	booktitle={Pre-Proceedings Workshop on Multiset Processing},
	year={2000},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Suzuki:GECCO2000:A_New_Molecular_Comp:00,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={A New Molecular Computing Model, Artificial Cell Systems},
	booktitle={Genetic and Evolutionary Computation Conf. GECCO},
	year={2000},
	publisher={Morgan Kaufman},
	pages={833--840}
}

@inproceedings{Suzuki:CEC2000:Computational_Living:00,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={Computational Living Systems Based on an Abstract Chemical System},
	booktitle={Proc. CEC2000},
	year={2000},
	publisher={IEEE},
	pages={1369--1376}
}

@inproceedings{Suzuki:SAB2000:Adaptive_Behavior:2000,
	author={Yasuhiro Suzuki and Junji Takabayashi and Hiroshi Tanaka},
	title={Adaptive Behavior in a Tritrophic Interactions Consisting of Plants, Herbivors
		and Carnivores},
	booktitle={The Sixth International Conference on the Simulation of Adaptive Behavior
		(SAB2000) September 11-15 2000, Paris, France},
	year={2000},
	month={September}
}

@inproceedings{Obtulo:MP2001:On_P_Systems_with_Ac:01,
	author={Adam Obtulowicz},
	title={On {P} systems with Active Membranes Solving Integer Factorizing Problem
		in a Polynomial Time},
	booktitle={Multiset Processing: Mathematical, Computer Science, and Molecular Computing
		Points of View},
	year={2001},
	publisher={Springer-Verlag},
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	pages={267--286},
	abstract={There are presented deterministic P systems with active membranes which
		are able to solve the Integer Factorization Problem in a polynomial time,
		which is the main result of the paper. There is introduced a class of programs
		for the description and correct implementation of algorithms of elementary
		number theory in nonstandard computing systems, especially in P systems
		with active membranes. By using some of these programs there is achieved
		the main result.},
	series={Lecture Notes in Computer Science},
	volume={2235}
}

@inproceedings{Atanas:PreWMC2001:Recursive_Calculus_w:01,
	author={Adrian Atanasiu and Carlos Mart{\'i}n-Vide},
	title={Recursive Calculus with Membranes},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Dovier:MP2001:Multiset_Constraints:01,
	author={Agostino Dovier and Carla Piazza and Gianfranco Rossi},
	title={Multiset Constraints and {P} systems},
	booktitle={Multiset Processing: Mathematical, Computer Science, and Molecular Computing
		Points of View},
	year={2001},
	publisher={Springer-Verlag},
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	pages={103--122},
	abstract={Multisets are the fundamental data structure of P systems. In this paper
		we relate P systems with the language and theory for multisets presented
		in [9.] This allows us, on the one hand, to define and implement P systems
		using multiset constraints in a constraint logic programming framework,
		and, on the other hand, to define and implement constraint solving procedures
		used to test multiset constraint satisfiability in terms of P systems with
		active membranes. While the former can be exploited to provide a precise
		formulation of a P system, as well as a working implementation of it, based
		on a first-order theory, the latter provides a way to obtain a P system
		for a given problem (in particular, NP problems) starting from a rather
		natural encoding of its solution in terms of multiset constraints.},
	series={Lecture Notes in Computer Science},
	volume={2235}
}

@inproceedings{Paun:MDNABC2001:On_P_Systems_with_Gl:01,
	author={Andrei Paun},
	title={On {P} systems with Global Rules},
	booktitle={Proc. 7th Intern. Meeting on DNA Based Computers},
	year={2001},
	address={Tampa, Florida, USA},
	editor={Natasha Jonoska and N.C. Seeman},
	pages={43--52}
}

@inproceedings{Paun:PreWMC2001:P_Systems_with_Strin:01,
	author={Andrei Paun},
	title={{P} systems with String-Objects: Universality Results},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{VBar:ECAL2001:Bio-Language_for_Com:01,
	author={Angel V. Baranda and Juan Castellanos and Fernando Arroyo and Carmen Luengo},
	title={Bio-Language for Computing with Membranes},
	booktitle={Advances in Artificial Life : 6th European Conference, ECAL 2001, Prague,
		Czech Republic, September 10-14, 2001, Proceedings.},
	year={2001},
	month={September},
	publisher={Springer-Verlag},
	address={Praga},
	editor={Jozef Kelemen and Petr Sosik},
	pages={176--185},
	abstract={This paper presents a bio-language that integrates data structures and processes
		for a formal computational model from the field of computing with membranes.
		A bio-language is a new concept extracted from biological behaviour. In
		order to define such a bio-language, the static and dynamic structures
		of a Transition P system are formalised.},
	series={LNAI},
	volume={2159}
}

@inproceedings{VBar:MDNABC2001:Towards_an_Electroni:01,
	author={Angel V. Baranda and Juan Castellanos and Fernando Arroyo and Rafael Gonzalo},
	title={Towards an Electronic Implementation of Membrane Computing: A Formal Description
		of Nondeterministic Evolution in Transition {P} systems},
	booktitle={Proc. 7th Intern. Meeting on DNA Based Computers},
	year={2001},
	address={Tampa, Florida, USA},
	editor={Natasha Jonoska and N.C. Seeman},
	pages={273--282}
}

@inproceedings{Martin:MCU2001:Computing_with_Membr:01,
	author={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Computing with Membranes ({P} systems): Universality Results},
	booktitle={Machines, Computations, and Universality. Third International Conference,
		MCU 2001 Chisinau, Moldava, May 23-27, 2001. Proceedings.},
	year={2001},
	publisher={Springer-Verlag},
	address={Chisinau, Moldova},
	editor={Maurice Margenstern and Yurii Rogozhin},
	pages={82--101},
	abstract={This is a survey of universality results in the area of Membrane Computing
		(P systems), at the level of December 2001. We consider both P systems
		with symbol-objects and with string-objects; in the latter case, we consider
		systems based on rewriting, splicing, as well as rewriting together with
		other operations (replication, crossingover), with sets or with multisets
		of strings. Besides recalling characterizations of recursively enumerable
		languages and of recursively enumerable sets of vectors of natural numbers,
		we also briefly discuss the techniques used in the proofs of such results.
		Several open problems are also formulated.},
	series={Lecture Notes in Computer Science},
	volume={2055}
}

@inproceedings{Ferret:PreWMC2001:On_Three_Variants_of:01,
	author={Claudio Ferretti and Giancarlo Mauri and Gheorghe P{\u a}un and Claudio
		Zandron},
	title={On Three Variants of {P} systems with String-Objects},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Zandron:MCU2001:Two_Normal_Forms_for:01,
	author={Claudio Zandron and Claudio Ferretti and Giancarlo Mauri},
	title={Two Normal Forms for Rewriting {P} systems},
	booktitle={Machines, Computations, and Universality. Third International Conference,
		MCU 2001 Chisinau, Moldava, May 23-27, 2001. Proceedings.},
	year={2001},
	publisher={Springer-Verlag},
	address={Chisinau, Moldova},
	editor={Maurice Margenstern and Yurii Rogozhin},
	pages={153--164},
	abstract={P systems have been recently introduced by Gh. Paun as a new model for molecular
		computations based on the notion of membrane structure. In this work, we
		consider Rewriting P Systems which use electrical charges to move objects
		between the membranes. We show that electrical charges, a feature introduced
		in order to obtain more �realistic� systems, induces simple systems: we
		define two normal forms for two variants of Rewriting P Systems which make
		use of electrical charges.},
	series={Lecture Notes in Computer Science},
	volume={2055}
}

@inproceedings{Nico:PreWMC2001:A_C_Library_for_Im:01,
	author={Dan V. Nicolau-Jr. and Gerardin Solana and Florin Fulga and Dan V. Nicolau-Sr.},
	title={A {C} Library for Implementing {P} systems on the Electronic Computer ({A}bstract)},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Besozz:ICTCS2001:P_Systems_with_Gemma:01,
	author={Daniela Besozzi and Claudio Zandron and Giancarlo Mauri and N. Sabadini},
	title={{P} systems with Gemmation of Mobile Membranes},
	booktitle={Theoretical Computer Science. 7th Italian Conference, ICTCS 2001, Torino,
		Italy, October 4-6, 2001. Proceedings.},
	year={2001},
	month={October},
	publisher={Springer-Verlag},
	address={Turin},
	editor={Antonio Restivo and Simona Ronchi-Della-Rocca and Luca Roversi},
	pages={136--153},
	abstract={P systems are computational models inspired by some biological features
		of the structure and the functioning of real cells. In this paper we introduce
		a new kind of communication between membranes, based upon the natural budding
		of vesicles in a cell. We define the operations of gemmation and fusion
		of mobile membranes, and we use membrane structures and rules over strings
		of biological inspiration only. We prove that P systems of this type can
		generate all recursively enumerable languages and, moreover, the Hamiltonian
		Path Problem can be solved in a quadratic time. Some open problems are
		also formulated.},
	series={Lecture Notes in Computer Science},
	volume={2202}
}

@inproceedings{Arroyo:PreWMC2001:A_Recursive_Algorith:01,
	author={Fernando Arroyo and Angel V. Baranda and Juan Castellanos and Carmen Luengo
		and Luis F. Mingo},
	title={A Recursive Algorithm for Describing Evolution in Transition {P} systems},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Arroyo:MP2001:Structures_and_Bio-L:01,
	author={Fernando Arroyo and Angel V. Baranda and Juan Castellanos and Carmen Luengo
		and Luis F. Mingo},
	title={Structures and Bio-Language to Simulate Transition {P} systems on Digital
		Computers},
	booktitle={Multiset Processing: Mathematical, Computer Science, and Molecular Computing
		Points of View},
	year={2001},
	publisher={Springer-Verlag},
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	pages={1--16},
	abstract={The aim of this paper is to show that some computational models inspired
		from biological membranes, such as P systems, can be simulated on digital
		computers in an efficient manner. To this aim, it is necessary to characterize
		non-determinism and parallel execution of evolution rules inside regions.
		Both these issues are formally described here in order to obtain a feasible
		description in terms of data structures and operations able to be implemented
		in a functional programming language. Static and dynamic structures of
		transition P systems are formalised in order to define a bio-language to
		represent them. Finally, a draft of a language for describing a transition
		P systems is presented. It will facilitate the description of transition
		P systems in terms of sentences in a high level programming language; such
		sentences will define a program. A process of compilation will parse the
		program to appropriate data structures and will launch the execution of
		the simulation process.},
	series={Lecture Notes in Computer Science},
	volume={2235}
}

@inproceedings{Cioban:PreWMC2001:Gene_Expression_by_S:01,
	author={Gabriel Ciobanu and Bogdan Tanasa},
	title={Gene Expression by Software Mechanisms},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Cioban:PreWMC2001:Membrane_SoftwareA:01,
	author={Gabriel Ciobanu and Dorin Paraschiv},
	title={Membrane Software. {A} {P} system Simulator},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Paun:PreWMC2001:Further_Research_Top:01,
	author={Gheorghe P{\u a}un},
	title={Further Research Topics About {P} systems},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{LGia:PreWMC2001:MGS:_Implementing_a_:01,
	author={Jean-Louis Giavitto and Olivier Michel},
	title={{MGS}: Implementing a Unified View on Four Biologically Inspired Computing
		Models},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Aguado:PreWMC2001:P_Systems_with_Repli:01,
	author={Joaqu{\'i}n Aguado and Tudor Balanescu and Tony Cowling and Marian Gheorghe
		and Florentin Ipate},
	title={{P} systems with Replicated Rewriting and Stream {X-Machines}},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Mate:PreWMC2001:On_the_Power_of_P_Sy:01,
	author={Jos{\'e} L. Mat{\'e} and Alfonso Rodr{\'i}guez-Pat{\'o}n and Andr{\'e}s Silva},
	title={On the Power of {P} systems with {DNA-Worms}},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Mutyam:MCU2001:membrane_creation:2001,
	author={Madhu Mutyam and Kamala Krithivasan},
	title={P Systems with Membrane Creation: Universality and Efficiency},
	booktitle={Machines, Computations, and Universality: Third International Conference,
		MCU 2001 Chisinau, Moldavia, May 23-27, 2001, Proceedings},
	year={2001},
	month={May 23-27},
	publisher={Springer-Verlag Heidelberg},
	editor={M. Margenstern, Y. Rogozhin},
	pages={276--287},
	abstract={P systems, introduced by Gh. Paun form a new class of distributed computing
		model. Several variants of P systems were already shown to be computationally
		universal. In this paper, we propose a new variant of P systems, P systems
		with membrane creation, in which some objects are productive and create
		membranes. This new variant of P systems is capable of solving the Hamiltonian
		Path Problem in linear time. We show that P systems with membrane creation
		are computationally complete.},
	series={Lecture Notes In Computer Science},
	volume={2055}
}

@inproceedings{Kudlek:MP2001:Toward_a_Formal_Macr:01,
	author={Manfred Kudlek and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Toward a Formal Macroset Theory},
	booktitle={Multiset Processing: Mathematical, Computer Science, and Molecular Computing
		Points of View},
	year={2001},
	publisher={Springer-Verlag},
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	pages={123--134},
	abstract={A macroset is a (finite or infinite) set of multisets over a finite alphabet.
		We introduce a Chomsky-like hierarchy of multiset rewriting devices which,
		therefore, generate macrosets. Some results are proved about the power
		of these devices and some open problems are formulated. We also present
		an algebraic characterization of some of the macroset families as least
		fixed point solutions of algebraic systems of equations.},
	series={Lecture Notes in Computer Science},
	volume={2235}
}

@inproceedings{Gheorg:IPCAT2001:Computational_models:01,
	author={Marian Gheorghe and Mike Holcombe and Petros Kefalas},
	title={Computational models of collective foraging},
	booktitle={Proc. Fourth Intern. Workshop on Information Processing in IPCAT 2001, Cells
		and Tissues},
	year={2001},
	month={August},
	address={Brussels}
}

@inproceedings{Margen:MDNABC2001:Computing_with_Membr:01,
	author={Maurice Margenstern and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Computing with Membranes, Variants with an Enhanced Membrane Handling},
	booktitle={Proc. 7th Intern. Meeting on DNA Based Computers},
	year={2001},
	address={Tampa, Florida, USA},
	editor={Natasha Jonoska and N.C. Seeman},
	pages={53--62}
}

@inproceedings{Margenstern:7DNABC:Enhanced_Membrane_Handling:2001,
	author={Maurice Margenstern and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Computing with Membranes: Variants with an Enhanced Membrane Handling},
	booktitle={Proceedings 7th International Meeting on DNA Based Computers},
	year={2001},
	month={June 10-13},
	address={Tampa, Florida, USA},
	editor={N. Jonoska, N.C. Seeman},
	pages={53--62}
}

@inproceedings{Holcom:IPCAT2001:A_hybrid_machine_mod:01,
	author={Mike Holcombe and Lucy Holcombe and Marian Gheorghe and N. Talbot},
	title={A hybrid machine model of rice blast fungus Magnaporthe grisea},
	booktitle={Proc. Fourth Intern. Workshop on Information Processing in IPCAT 2001, Cells
		and Tissues},
	year={2001},
	month={August},
	address={Brussels}
}

@inproceedings{Madhu_:MP2001:Universality_Results:01,
	author={Mutyam Madhu and Kamala Krithivasan},
	title={Universality Results for Some Variants of {P} systems},
	booktitle={Multiset Processing: Mathematical, Computer Science, and Molecular Computing
		Points of View},
	year={2001},
	publisher={Springer-Verlag},
	address={Berlin},
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	pages={237--253},
	abstract={P systems, introduced by Gh. Paun, form a new class of distributed computing
		models. Many variants of P systems were shown to be computationally universal.
		In this paper, we consider several classes of P systems with symbol-objects
		where we allow the catalysts to move in and out of a membrane. We prove
		universality results for these variants of P systems with a very small
		number of membranes.},
	series={Lecture Notes in Computer Science},
	volume={2235}
}

@inproceedings{Madhu_:MCU2001:P_Systems_with_Membr:01,
	author={Mutyam Madhu and Kamala Krithivasan},
	title={{P} systems with Membrane Creation: Universality and Efficiency},
	booktitle={Machines, Computations, and Universality. Third International Conference,
		MCU 2001 Chisinau, Moldava, May 23-27, 2001. Proceedings.},
	year={2001},
	publisher={Springer-Verlag},
	address={Berlin},
	editor={Maurice Margenstern and Yurii Rogozhin},
	pages={276--287},
	abstract={P systems, introduced by Gh. Paun form a new class of distributed computing
		model. Several variants of P systems were already shown to be computationally
		universal. In this paper, we propose a new variant of P systems, P systems
		with membrane creation, in which some objects are productive and create
		membranes. This new variant of P systems is capable of solving the Hamiltonian
		Path Problem in linear time. We show that P systems with membrane creation
		are computationally complete.},
	series={Lecture Notes in Computer Science},
	volume={2055}
}

@inproceedings{Sosik:CDLT2001:String_Rewriting_Seq:01,
	author={Petr Sosik and Rudolf Freund},
	title={String Rewriting Sequential {P} systems and Regulated Rewriting},
	booktitle={Proc. Conf. Developments in Language Theory},
	year={2001},
	address={Vienna}
}

@inproceedings{Frisco:PreWMC2001:A_Direct_Constructio:01,
	author={Pierluigi Frisco and Hendrik Jan Hoogeboom and Paul Sant},
	title={A Direct Construction of a Universal {P} system},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Freund:DNA6:Generalized_Homogeneous:2001,
	author={Rudolf Freund and Franziska Freund},
	title={Molecular Computing with Generalized Homogeneous {P}-Systems},
	booktitle={DNA Computing: 6th International Workshop on DNA-Based Computers, DNA 2000,
		Leiden, The Netherlands, June 13-17, 2000, Revised Papers},
	year={2001},
	month={June},
	publisher={Springer-Verlag Heidelberg},
	address={Leiden, The Netherlads},
	editor={A. Condon and G. Rozenberg},
	pages={113--125},
	abstract={Recently P-systems were introduced by Gheorghe Paun as a new model for computations
		based on membrane structures. The basic variants of P-systems shown to
		have universal computational power only took account of the multiplicities
		of atomic objects, some other variants considered rewriting rules on strings.
		Using the membranes as a kind of filter for specific objects when transferring
		them into an inner compartment or out into the surrounding compartment
		turned out to be a very powerful mechanism in combination with suitable
		rules to be applied within the membranes in the model of generalized P-systems,
		GP-systems for short. GP-systems were shown to allow for the simulation
		of graph controlled grammars of arbitrary type based on productions working
		on single objects; moreover, various variants of GP-systems using splicing
		or cutting and recombination of strings were shown to have universal computational
		power, too. In this paper, we consider GP-systems with homogeneous membrane
		structures, GhP-systems for short, using splicing or cutting and recombination
		of string objects with specific markers at the ends of the strings that
		can be interpreted as electrical charges. The sum of these electrical charges
		determines the permeability of the membranes to the string objects, and
		we allow only objects with the absolute value of the difference of electrical
		charges being equal to 1 to pass a membrane in both directions. We show
		that such GhP-systems have universal computational power; for GhP-systems
		using splicing and a bounded number of markers the obtained results are
		optimal with respect to the underlying membrane structure. Moreover, a
		very restricted variant of such GhP-systems characterizes the (strictly)
		minimal linear languages.},
	series={Lecture Notes In Computer Science},
	volume={2054}
}

@inproceedings{Freund:PreWMC2001:Variants_of_GP_Syste:01,
	author={Rudolf Freund and Marion Oswald},
	title={Variants of {GP Systems}},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Kris:PreWMC2001:On_the_Power_of_P_Sy:01,
	author={Shankara-Narayanan Krishna and Kuppuswamy Lakshmanan and Raghavan Rama},
	title={On the Power of {P} systems with Contextual Rules},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Kris:MDNABC2001:Insertion-Deletion_P:01,
	author={Shankara-Narayanan Krishna and Raghavan Rama},
	title={Insertion-Deletion {P} systems},
	booktitle={Proc. 7th Intern. Meeting on DNA Based Computers},
	year={2001},
	address={Tampa, Florida, USA},
	editor={Natasha Jonoska and N.C. Seeman},
	pages={350--359}
}

@inproceedings{Marcus:PreWMC2001:Membranes_versus_DNA:01,
	author={Solomon Marcus},
	title={Membranes versus {DNA}},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Ji:PreWMC2001:The_Bhopalator:_An_I:01,
	author={Sungchul Ji},
	title={The {Bhopalator}: An Information/Energy Dual Model of the Living Cell},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Nish:PreWMC2001:Simulations_of_Photo:01,
	author={Taishin Yasunobu Nishida},
	title={Simulations of Photosynthesis by a {K}-{S}ubset Transforming System with
		Membranes},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Manca:PreWMC2001:Membrane_Algorithms_:01,
	author={Vincenzo Manca},
	title={Membrane Algorithms for Propositional Satisfiability},
	booktitle={Pre-Proceedings of Workshop on Membrane Computing},
	year={2001},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Suzuki:MP2001:Artificial_Life_Appl:01,
	author={Yasuhiro Suzuki and Yoshi Fujiwara and Hiroshi Tanaka and Junji Takabayashi},
	title={Artificial Life Applications of a Class of {P} systems: Abstract Rewriting
		Systems on Multisets},
	booktitle={Multiset Processing: Mathematical, Computer Science, and Molecular Computing
		Points of View},
	year={2001},
	publisher={Springer-Verlag},
	address={Berlin},
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	pages={299--346},
	abstract={Artificial chemical system are well studied in Artificial Life and Complexity.
		Here we overview results about such a class of artificial chemical systems:
		Rewriting Systems on Multisets (ARMS), which are particular types of P
		Systems and exhibit complex behaviors such as non-linear oscillations.
		In short, an ARMS consists of a membrane which contains �chemical compounds�
		(denoted by symbols); these compounds evolve through chemical reactions
		in a cell-like device. To such systems we apply a genetic method and, by
		a simulation on computer, we find several results of Artificial Life interest.},
	series={Lecture Notes in Computer Science},
	volume={2235}
}

@inproceedings{Obtulo:Pre2WMC2002:Probabilistic_P_syst:02,
	author={Adam Obtulowicz},
	title={Probabilistic {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Atanas:Pre2WMC2002:Authentication_of_me:02,
	author={Adrian Atanasiu},
	title={Authentication of messages using {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Romero:UMC02:Diophantine:2002,
	author={Alvaro Romero-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Generation of Diophantine Sets by Computing P Systems with External Output},
	booktitle={Unconventional Models of Computation: Third International Conference, UMC
		2002, Kobe, Japan, October 15-19, 2002. Proceedings},
	year={2002},
	month={October 15--19},
	publisher={Springer-Verlag Heidelberg},
	address={London, UK},
	editor={Cristian Calude and Michael J. Dinneen and Ferdinand Peper},
	pages={176--190},
	abstract={In this paper a variant of P systems with external output designed to compute
		functions on natural numbers is presented. These P systems are stable under
		composition and iteration of functions. We prove that every diophantine
		set can be generated by such P systems; then, the universality of this
		model can be deduced from the theorem by Matiyasevich, Robinson, Davis
		and Putnam in which they establish that every recursively enumerable set
		is a diophantine set.},
	series={Lecture Notes In Computer Science},
	volume={2509}
}

@inproceedings{Paun:Pre2WMC2002:Membrane_systems_wit:02,
	author={Andrei Paun},
	title={Membrane systems with symport/antiport. {Universality} results},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Profir:Pre2WMC2002:P_systems_of_biocomp:02,
	author={Aurelia Profir and Elena Boian},
	title={{P} systems of biocomputing systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Besozz:Pre2WMC2002:Parallel_rewritint_P:02,
	author={Daniela Besozzi and Giancarlo Mauri and Claudio Zandron},
	title={Parallel rewritint {P} systems without target conflicts},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Balbot:Pre2WMC2002:A_MzScheme_implement:02,
	author={Delia Balbotin-Noval and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={A {MzScheme} implementation of transition {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Csuhaj:Pre2WMC2002:P_Automata:02,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy{\"o}rgy Vaszil},
	title={{P Automata}},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Czeizl:Pre2WMC2002:Self-activating_P_sy:02,
	author={Eugen Czeizler},
	title={Self-activating {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Arroyo:Pre2WMC2002:A_software_simulatio:02,
	author={Fernando Arroyo and Carmen Luengo and Angel V. Baranda and L.F. de Mingo},
	title={A software simulation of transition {P} systems in {H}askell},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Bernar:Pre2WMC2002:P_systems_with_bound:02,
	author={Francesco Bernardini and Vincenzo Manca},
	title={{P} systems with boundary rules},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Cioban:Pre2WMC2002:Molecular_Networks_a:02,
	author={Gabriel Ciobanu and Bogdan Tanasa and Daniel Dumitriu and Dorin Huzum and
		Gabriel Moruz},
	title={Molecular Networks as Communicating Membranes},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Cioban:Pre2WMC2002:Membrane_systems_and:02,
	author={Gabriel Ciobanu and Rahul Desai and Akash Kumar},
	title={Membrane systems and distributed computing},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Bel_En:Pre2WMC2002:P_systems_a_prelimi:02,
	author={Gemma Bel-Enguix},
	title={{P} systems, a preliminary application to linguistics},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Bel_En:Pre2WMC2002:Generating_context-f:02,
	author={Gemma Bel-Enguix and Matteo Cavaliere and Rodica Ceterchi and Carlos Mart{\'i}n-Vide},
	title={Generating context-free languages with dynamic {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Alford:Pre2WMC2002:Membrane_systems_wit:02,
	author={Gordon Alford},
	title={Membrane systems with heat control},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Ardele:Pre2WMC2002:The_relevance_of_mic:02,
	author={Ioan I. Ardelean},
	title={The relevance of microbiology for {P} systems. A discussion of some concepts
		used in microbiology and {P Systems}},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Bartosik:Systemy_Mem:PEIZ:2002,
	author={J. Bartosik and Waldemar Korczynski},
	title={Systemy membranowe jako modele hierarchicznych struktur zarzadzania},
	booktitle={Mat. Pokonferencyjne Ekonomia, Informatyka, Zarzadzanie. Teoria i Praktyka},
	year={2002},
	organization={Wydzial Zarzadzania AGH, Tom II, AGH}
}

@inproceedings{LGia:Pre2WMC2002:Accretive_rules_in_C:02,
	author={Jean-Louis Giavitto and Olivier Michel},
	title={Accretive rules in {Cayley} {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Arulanandham:UMC02:Bead_Sort:2002,
	author={Joshua J. Arulanandham},
	title={Implementing Bead-Sort with {P} systems},
	booktitle={Unconventional Models of Computation: Third International Conference, UMC
		2002, Kobe, Japan, October 15-19, 2002. Proceedings},
	year={2002},
	month={October 15--19},
	publisher={Springer-Verlag Heidelberg},
	address={London, UK},
	editor={Cristian Calude and Michael J. Dinneen and Ferdinand Peper},
	pages={115--125},
	abstract={In this paper, we implement Bead-Sort, a natural sorting algorithm that
		we introduced in [1], with the new, biochemically inspired P systems. In
		Bead-Sort, positive integers are represented by a set of beads (like those
		used in an Abacus). The beads representing integers to be sorted are allowed
		to slide through the rods of the Abacus. In this process, the smaller "numbers"
		always emerge above the larger ones and this creates a natural comparison
		and thus a natural sorting action. This natural sorting phenomenon is "implemented"
		with a special type of P system -- a tissue P system that computes by means
		of communication (using symport/antiport rules) only. Beads are represented
		by objects placed within membranes of a tissue P system; a rod is represented
		by a 'group' of membranes that can communicate with one another by means
		of symport/antiport rules. The "flow" of objects between the group of membranes
		representing a rod (using communication rules) reflects the actual flow
		of beads in the physical system.},
	series={Lecture Notes In Computer Science},
	volume={2509}
}

@inproceedings{Kudlek:Pre2WMC2002:Some_Considerations_:02,
	author={Manfred Kudlek and Victor Mitrana},
	title={Some Considerations on a Multiset Model for Membrane Computing},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Pere:Pre2WMC2002:Decision_P_systems_a:02,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Decision {P} systems and the {P} $ \neq $ {NP} conjecture},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Ionesc:Pre2WMC2002:P_systems_with_sympo:02,
	author={Mihai Ionescu and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={{P} systems with symport/antiport rules: The traces of objects},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Madhu:DCFS-2002:Complexity_Issues_in:02,
	author={Mutyam Madhu},
	title={Complexity Issues in Rewriting {P} systems},
	booktitle={Pre-proceedings of Fourth International Workshop on Descriptional Complexity
		of Formal Systems, DCFS-2002},
	year={2002},
	month={August 21-24},
	address={London, Ontario, Canada}
}

@inproceedings{Madhu:Pre2WMC2002:A_Survey_on_Some_Var:02,
	author={Mutyam Madhu and Kamala Krithivasan},
	title={A Survey on Some Variants {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Botton:FNC2002:Rewriting_P_Systems_:02,
	author={Paolo Bottoni and Anna Labella and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Rewriting {P} systems with Conditional Communication},
	booktitle={Formal and Natural Computing: Essays Dedicated to Grzegorz Rozenberg},
	year={2002},
	publisher={Springer-Verlag},
	address={Berlin},
	editor={W. Brauer and H. Ehrig and J. Karhum{\"a}ki and Arto Salomaa},
	pages={325--353},
	abstract={A membrane system (P system) is a model of computation inspired by some
		basic features of the structure and behaviour of living cells. In this
		paper we consider systems with string-objects processed by rewriting, with
		the communication controlled by conditions on the contents of the strings.
		Symbols, substrings (in an arbitrary place, or as a prefix/suffix), or
		the shape of the whole string are used as permitting and as forbidding
		conditions when moving strings from a membrane to a neighboring membrane.
		Many of the obtained variants lead to new characterizations of recursively
		enumerable languages (as expected, these characterizations indicate a trade-off
		between the number of membranes and the strength of the communication conditions
		used). Several open problems are also formulated.},
	series={Lecture Notes in Computer Science},
	volume={2300}
}

@inproceedings{Sosik:Pre2WMC2002:P_systems_versus_reg:02,
	author={Petr Sosik},
	title={{P} systems versus register machines: two universality proofs},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Sosik:UMC02:communication_enough:2002,
	author={Petr Sos{\'i}k and Jir{\'i} Mat{\'y}sek},
	title={Membrane computing: when communication is enough},
	booktitle={Unconventional Models of Computation: Third International Conference, UMC
		2002, Kobe, Japan, October 15-19, 2002. Proceedings},
	year={2002},
	month={October 15--19},
	publisher={Springer-Verlag Heidelberg},
	address={London, UK},
	editor={Cristian Calude and Michael J. Dinneen and Ferdinand Peper},
	pages={264--275},
	abstract={We study the computational power of P system, the mathematical model of
		cellular membrane systems whose operations are motivated by some principles
		of regulated transfer of objects (molecules) through membranes and simple
		mutual reactions of these objects. The original model of P system describes
		several possible types of operations applicable to these objects, resulting
		in universal computational power. We show that P systems with symbol objects
		keep their universal computational power even if we restrict ourselves
		to catalyzed transport of objects through labelled membranes without their
		change or mutual reactions. Each transport operation is initiated by a
		complex of at most two objects. Moreover we do not need some other mathematical
		tools of P systems like priorities of operators or dissolution or creation
		of membranes to reach the universal computational power. In the second
		part of the paper we present a communicating P-system computing optimal
		parallel algorithm for finding maximum of a given set of integers. We therefore
		demonstrate that despite the simplicity of the model, it is (theoretically)
		capable to solve nontrivial computing tasks in a highly parallel and effective
		way.},
	series={Lecture Notes In Computer Science},
	volume={2509}
}

@inproceedings{Frisco:Pre2WMC2002:Simulating_counter_a:02,
	author={Pierluigi Frisco and Hendrik Jan Hoogeboom},
	title={Simulating counter automata by {P} systems with symport/antiport},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Frisco:Pre2WMC2002:Towards_a_hierarchy_:02,
	author={Pierluigi Frisco and Sungchul Ji},
	title={Towards a hierarchy of info-energy {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Frisco:DNA82002:Info-energy_P_system:02,
	author={Pierluigi Frisco and Sungchul Ji},
	title={Info-energy {P} systems},
	booktitle={Proceedings DNA 8 conference},
	year={2002},
	month={June},
	address={Sapporo, Japan},
	organization={Hokkaido University}
}

@inproceedings{Ceterc:Pre2WMC2002:Generating_P_systems:02,
	author={Rodica Ceterchi and Carlos Mart{\'i}n-Vide},
	title={Generating {P} systems with contextual grammar},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Freund:Pre2WMC2002:Energy-controlled_P_:02,
	author={Rudolf Freund},
	title={Energy-controlled {P} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Narayanan:UMC02:Minimal_mode:2002,
	author={Shankara Narayanan Krishna and Raghavan Rama},
	title={On The Power of Tissue {P} systems Working in Minimal Mode},
	booktitle={Unconventional Models of Computation: Third International Conference, UMC
		2002, Kobe, Japan, October 15-19, 2002. Proceedings},
	year={2002},
	month={October 15--19},
	publisher={Springer-Verlag Heidelberg},
	address={London, UK},
	editor={Cristian Calude and Michael J. Dinneen and Ferdinand Peper},
	pages={208--219},
	abstract={In this paper, we continue the study of tissue P systems ( systems) recently
		introduced by C. MartinVide et.al in [5]. We consider here only systems
		working in the minimal mode. All the results in this paper are solutions
		to some of the open problems listed in [5] with respect to systems working
		in the minimal mode. We obtain two characterizations of recursively enumerable
		languages: systems having 2 cells and 3 states as well as systems having
		4 cells and 2 states generate . We also show that 2 cells and 2 states
		are sufficient for generating languages, whereas 3 cells and 2 states are
		sufficient for generating languages.},
	series={Lecture Notes In Computer Science},
	volume={2509}
}

@inproceedings{Kris:Pre2WMC2002:Tissue_P_systems_wit:02,
	author={Shankara-Narayanan Krishna and Kuppuswamy Lakshmanan and Raghavan Rama},
	title={Tissue {P} systems with contextual and rewriting rules},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Balane:Pre2WMC2002:A_variant_of_EP_syst:02,
	author={Tudor Balanescu and Marian Gheorghe and Mike Holcombe and Florentin Ipate},
	title={A variant of {EP} systems},
	booktitle={Pre-Proceedings of Second Workshop on Membrane Computing},
	year={2002},
	month={August},
	address={Curtea de Arges, Romania}
}

@inproceedings{Obtulo:BWMC2003:Mathematical_Models_:03,
	author={Adam Obtulowicz},
	title={Mathematical Models of Uncertainty with a Regard to Membrane Systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={241--246}
}

@inproceedings{Obtulo:WMC-CdeA2002:Probabilistic_P_syst:03,
	author={Adam Obtulowicz},
	title={Probabilistic {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={377--387},
	abstract={There are introduced and discussed stochastic and randomized P systems.
		Stochastic P systems are aimed to describe distortions which may appear
		in evolution processes of membrane systems considered in the area of membrane
		computing. Randomized P systems serve for implementation of randomized
		algorithms. There is presented a family of randomized P systems which serve
		for implementation of Miller-Rabin randomized algorithm for primality of
		integers. P systems of this family verify primality of integers in a polynomial
		time, with a low error probability, and with a subexponential number of
		processors modelled as membranes with evolving contents.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Atanas:WMC-CdeA2002:Authentication_of_me:03,
	author={Adrian Atanasiu},
	title={Authentication of messages using {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={33--42},
	abstract={The paper is an attempt to use P systems in dealing with a cryptographic
		issue, that of message authentication. Two algorithms are proposed, with
		and without confirmation from the sender, based on P systems with active
		membranes. We are not concerned with the practical usefulness of these
		algorithms, but with proving the usefulness of the membrane computing framework
		in addressing the authentication question.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Georgi:PreWMC2003:Generative_devices_u:03,
	author={Alexandros Georgiou and Marian Gheorghe},
	title={Generative devices used in graphics},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={266--272}
}

@inproceedings{Romero:PreWMC2003:Computing_partial_re:03,
	author={Alvaro Romero-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Computing partial recursive functions through transition {P} systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={428--444}
}

@inproceedings{PerezJ:WMC2003:Computing_Partial_Re:03,
	author={{\'A}lvaro Romero-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Computing Partial Recursive Functions by Transition {P} systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={320--340},
	abstract={In this paper a variant of transition P systems with external output designed
		to compute partial functions on natural numbers is presented. These P systems
		are stable under composition, iteration and unbounded minimization (-recursion)
		of functions. We prove that every partial recursive function can be computed
		by such P systems, from which the computational completeness of this model
		can be deduced.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Cordon:BWMC2003:A_Prolog_Simulator_f:03,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Fernando Sancho-Caparrini},
	title={A {Prolog} Simulator for Deterministic {P} systems with Active Membranes},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={141--154}
}

@inproceedings{Cordon:WMC2003:Implementing_in_Prol:03,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Fernando Sancho-Caparrini},
	title={Implementing in {Prolog} an Effective Cellular Solution to the {Knapsack}
		Problem},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={140--152},
	abstract={In this paper we present an implementation in Prolog of an effective solution
		to the Knapsack problem via a family of deterministic P systems with active
		membranes using 2-division.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Cordon:PreWMC2003:Implementing_in_Prol:03,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Fernando Sancho-Caparrini},
	title={Implementing in {Prolog} an effective cellular solution for the {Knapsack}
		problem},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={185--196}
}

@inproceedings{PerezJ:BWMC2003:Formal_Verification_:03,
	author={Antonio P{\'e}rez-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Formal Verification of a Transition {P} system Generating the Set $2^n+n^2+n
		| n > 1$},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={261--269}
}

@inproceedings{PerezJ:BWMC2003:Computing_a_Partial_:03,
	author={Antonio P{\'e}rez-Jim{\'e}nez and Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Computing a Partial Mapping by a {P} system: Design and Verification},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={247--260}
}

@inproceedings{Mamata:WMC2003:A_Distributed_Simula:03,
	author={Apostolos Syropoulos and Eleftherios G. Mamatas and Peter C. Allilomes and
		Konstantinos T. Sotiriades},
	title={A Distributed Simulation of Transition {P} systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={357--368},
	abstract={P systems is a new model of computation, inspired by natural processes,
		that has a distributive nature. By exploring this distributive nature of
		P systems, we have built a purely distributive simulation of P systems.
		The simulation, whose implementation is described here, was programmed
		in the Java programming language and makes heavy use of its Remote Method
		Invocation protocol. The class of P systems that the simulator can accept
		is a subset of the family of systems, which have the computational power
		of Turing machines. The paper concludes with some remarks concerning the
		usefulness of the simulation. In addition, there is a brief discussion
		of some ideas that can be used in the formulation of a foundation of distributive
		computing.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Alhazo:BWMC2003:Minimizing_Evolution:03,
	author={Artiom Alhazov},
	title={Minimizing Evolution-Communication {P} systems and {EC} {P} automata},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={23--31}
}

@inproceedings{Alhazo:BWMC2003:Generating_Classes_o:03,
	author={Artiom Alhazov},
	title={Generating Classes of Languages by {P} systems and Other Devices},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={18--22}
}

@inproceedings{Alhazo:PreWMC2003:Static_sorting_algor:03,
	author={Artiom Alhazov and Dragos Sburlan},
	title={Static sorting algorithms for {P} systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={17--40}
}

@inproceedings{Alhazov:WMC2003:Proton_Pumping_P_Sys:03,
	author={Artiom Alhazov and Matteo Cavaliere},
	title={Proton Pumping {P} systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={1--18},
	abstract={We propose here a (biologically inspired) model of P system called proton
		pumping P system that is a special case of evolution-communication P system.
		In cell biology there are transport mechanisms, involving protons. We generalize
		this idea by considering a few different types of protons. A proton pumping
		P system is, essentially, an evolution-communication P system where a special
		subset of symbol-objects (called protons) is used. In such a system we
		have simple evolution rules (classical evolution rules without target indications),
		symport and antiport rules that exchange some objects (among them, possibly,
		other protons) for a proton; taking inspiration from biology, this particular
		type of antiports is often called proton pumping rules. We show that, as
		expected, the new model is universal, using non-cooperative rules, symport
		and antiport rules of weight one, and enough types of protons available
		for the computation. If we decrease the number of types of protons to one
		or two, then the model is at least as powerful as ET0L system, provided
		that (total) weak or strong priority of antiport rules over symport and
		evolution rules are used. Finally, we consider some descriptional complexity
		measures (again, inspired from biology) for the newly introduced model.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Alhazo:PreWMC2003:Proton_pumping_P_sys:03,
	author={Artiom Alhazov and Matteo Cavaliere},
	title={Proton pumping {P} systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={1--16}
}

@inproceedings{Profir:PreWMC2003:Modeling_molecular_g:03,
	author={Aurelia Profir and Elena Boian},
	title={Modeling molecular genetic triggers by means of {P} systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={365--386}
}

@inproceedings{Petres:PreWMC2003:A_hardware_membrane_:03,
	author={Biljana Petreska and Christof Teuscher},
	title={A hardware membrane system},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={343--355}
}

@inproceedings{Petreska:WMC2003:A_Reconfigurable_Har:03,
	author={Biljana Petreska and Christof Teuscher},
	title={A Reconfigurable Hardware Membrane System},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={269--285},
	abstract={P systems are massively parallel systems and software simulations do no
		usually allow to exploit this parallelism. We present a parallel hardware
		implementation of a special class of membrane systems. The implementation
		is based on a universal membrane hardware component that allows to efficiently
		run membrane systems on specialized hardware such as FPGAs. The implementation
		is presented in detail as well as performance results and an example.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Kevorchian:AIDC:2003,
	author={C. Kevorchian},
	title={An algebraic topology approach of membrane computing},
	booktitle={Proc. AIDC'2003, Craiova, Romania.},
	year={2003}
}

@inproceedings{Besozzi:DNA8:Parallel_Rewriting:2003,
	author={Daniela Besozzi and Claudio Ferretti and Giancarlo Mauri and Claudio Zandron},
	title={Parallel Rewriting {P} systems with deadlock},
	booktitle={DNA Computing: 8th International Workshop on DNA-Based Computers, DNA8 Sapporo,
		Japan, June 10-13, 2002. Revised Papers},
	year={2003},
	publisher={Springer-Verlag Heidelberg},
	editor={Masami Hagiya and Azuma Ohuchi},
	pages={302--314},
	abstract={We analyze P systems with different parallel methods for string rewriting.
		The notion of deadlock state is introduced when some rules with mixed target
		indications are simultaneously applied on a common string. The computational
		power of systems with and without deadlock is analyzed and a lower bound
		for the generative power is given, for some parallelism methods. Some open
		problems are also formulated.},
	series={Lecture Notes In Computer Science},
	volume={2568}
}

@inproceedings{Besozz:BWMC2003:Hierarchies_of_Paral:03,
	author={Daniela Besozzi and Giancarlo Mauri and Claudio Zandron},
	title={Hierarchies of Parallel Rewriting {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={61--74}
}

@inproceedings{Besozz:WMC-CdeA2002:Parallel_rewritint_P:03,
	author={Daniela Besozzi and Giancarlo Mauri and Claudio Zandron},
	title={Parallel rewriting {P} systems without target conflicts},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={119--133},
	abstract={We consider rewriting P systems with parallel application of evolution rules,
		where no conflicts on the communication of objects can arise. Different
		parallelism methods are used and only rules which have the same target
		indication can be simultaneously applied to a common string. The computational
		power is analyzed, with respect to Lindenmayer systems, and some relations
		among different parallel rewriting P systems are studied. Some open problems
		are also formulated.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Besozzi:WMC2003:Collapsing_Hierarchi:03,
	author={Daniela Besozzi and Giancarlo Mauri and Gy{\"o}rgy Vaszil and Claudio Zandron},
	title={Collapsing Hierarchies of Parallel Rewriting {P} systems without Target
		Conflicts},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={55--69},
	abstract={We continue the investigation of parallel rewriting P systems without target
		conflicts, a class of rewriting P systems with parallel application of
		evolution rules where the possible consistency problems for the communication
		of the resulting strings are eliminated by not allowing the application
		of conflicting rules. We refine and improve some of the previously known
		results about the generative power of these systems and point out the problems
		which are still open for investigation. Work partially supported by contribution
		of the EU commission under The Fifth Framework Programme, project MolCoNet
		IST-2001-32008, and by contribution of the Hungarian Scientific Research
		Fund, OTKA, grant no. F 037567.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Besozz:PreWMC2003:Collapsing_hierarchi:03,
	author={Daniela Besozzi and Giancarlo Mauri and Gy{\"o}rgy Vaszil and Claudio Zandron},
	title={Collapsing hierarchies of parallel rewriting {P} systems without target
		conflicts},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={103--116}
}

@inproceedings{Besozz:EMCC2003:The_potential_of_P_s:03,
	author={Daniela Besozzi and Ioan I. Ardelean and Giancarlo Mauri},
	title={The potential of {P} systems for modelling the activity of mechanosensitive
		channels},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Besozz:PreWMC2003:The_potential_of_P_s:03,
	author={Daniela Besozzi and Ioan I. Ardelean and Giancarlo Mauri},
	title={The potential of {P} systems for modelling the activity of mechanosensitive
		channels},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={84--102}
}

@inproceedings{Balbot:WMC-CdeA2002:A_MzScheme_implement:03,
	author={Delia Balbotin-Noval and Mario Jes{\'u}s P{\'e}rez Jim{\'e}nez and Fernando Sancho Caparrini},
	title={A {MzScheme} implementation of transition {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={58--73},
	abstract={The main goal of this paper is to present the design of an MzScheme program
		that allows us to simulate the behavior of transition P systems. For that,
		a library of procedures have been developed that work in two stages. In
		the first one, the parsing/compiling stage, the input P system is checked,
		and if it is well defined, then it is represented by means of an internal
		grammar. In a second stage, the simulation, the computation tree associated
		to the P system is generated until a prefixed level.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Jackson:WMC2003:An_Agent-Based_Behav:03,
	author={Duncan Jackson and Marian Gheorghe and Mike Holcombe and Francesco Bernardini},
	title={An Agent-Based Behavioural Model of Monomorium Pharaonis Colonies},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={232--239},
	abstract={In this study X-machines and hierarchical organized X-machines will be used
		to model different aspects of the behaviour of social insect communities.
		The model is organized as a community of complex agents showing similarities
		to networks of P systems.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Csuhaj:EMCC2003:On_Gemmating_P_Syste:03,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u}},
	title={On Gemmating {P} systems},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Csuhaj:BWMC2003:From_Watson-Crick_L_:03,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un and
		Arto Salomaa},
	title={From {W}atson-{C}rick {L} {Systems} to {Darwinian} {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={155--170}
}

@inproceedings{Csuhaj:WMC-CdeA2002:P_Automata_or_Purely:03,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy{\"o}rgy Vaszil},
	title={{P Automata} or Purely Communicating Accepting {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={219--233},
	abstract={In this paper we introduce the notion of a P automaton with one-way communication,
		a concept related both to P systems and the traditional concept of automata.
		A P automaton with one-way communication is a purely communicating accepting
		P system. The result of the computation in these systems is the set of
		multiset sequences consumed by the skin membrane, supposing that the P
		automaton started functioning in an initial state and entered a so-called
		final state. As a result, we show that for any recursively enumerable language,
		a P automaton and a certain type of projection can be constructed such
		that the given language is obtained as the image of the set of accepted
		input multiset sequences of the P automaton.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Csuhaj:EMCC2003:The_Computational_Co:03,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy{\"o}rgy Vaszil},
	title={The Computational Complexity of {P} Automata, Accepting {P} systems with
		Communication Only},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Csuhaj:BWMC2003:New_Results_and_Rese:03,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy{\"o}rgy Vaszil},
	title={New Results and Research Directions Concerning {P Automata}, Accepting {P}
		systems with Communication Only},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={171--179}
}

@inproceedings{Czeizl:WMC-CdeA2002:Self-activating_P_sy:03,
	author={Eugen Czeizler},
	title={Self-activating {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={234--246},
	abstract={Until now, the solving of NP complete problems in polynomial time in the
		framework of P systems was accomplished by the use of three different techniques:
		the duplication of membranes, the creation of membranes, and the replication
		of strings. In this paper we introduce a new type of P systems which comes
		with a new technique of approaching this class of problems. In the initial
		configuration of these P systems we have an arbitrarily large number of
		unactivated base-membranes, which, in a polynomial time, are activated
		in an exponential number. Using these type of systems we solve the SAT
		problem in a linear time, with respect to the number of variables and clauses.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Arroyo:WMC-CdeA2002:A_software_simulatio:03,
	author={Fernando Arroyo and Carmen Luengo and Angel V. Baranda and Luis F. de Mingo},
	title={A software simulation of transition {P} systems in {H}askell},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={19--32},
	abstract={P systems are a parallel and distributed computational mo-del, based on
		the membrane structure notion. Membranes define regions. Inside regions,
		objects and rules are placed in order to make evolve the P system. Evolution
		is achieved by transitions between two consecutive system configurations.
		Therefore, a computation can be obtained as a transitions series between
		consecutive configurations. Where and how P systems can be implemented
		is nowadays an open problem, but implementation on digital computers could
		be one way to show the capabilities of such systems. This paper presents
		a transition P systems implementation in Haskell, based on a theoretical
		framework previously developed.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Arroyo:PreWMC2003:A_binary_data_struct:03,
	author={Fernando Arroyo and Carmen Luengo and Juan Castellanos and L.F. de Mingo},
	title={A binary data structure for membrane processors: Connectivity arrays},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={41--52.},
	abstract={This paper defines membrane processors as digital processors capable of
		implementing local processing performed inside membranes in transition
		P systems. In order to encode the membrane structures of transition P systems,
		additional binary data structures are needed. Such binary data structures
		are named connectivity arrays. The main purposes of the connectivity arrays
		are to distribute information about the system membrane structure among
		the different processors that implement the transition P system, and to
		facilitate communication processes among different membrane processors.
		The information kept in processor has to be versatile and compact; versatile
		means to easily permit changes in the membrane structure of the system
		processors, and compact means that not too much memory space is needed.
		Considering these two requests, a binary word of variable length is considered
		here in order to represent in membrane processors the local information
		about the membrane structures of transition P systems. This paper presents
		the abstract data type connectivity array which defines the data structure
		and the needed operations over it in order to parse the P system into a
		membrane processor tree and to keep congruent the P system membrane structure
		with the membrane processor tree.}
}

@inproceedings{Mingo:WMC2003:A_Binary_Data_Struct:03,
	author={Fernando Arroyo and Juan Castellanos and Carmen Luengo and Luis F. Mingo},
	title={A Binary Data Structure for Membrane Processors: Connectivity Arrays},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={19--30},
	abstract={This paper defines membrane processors as digital processors capable of
		implementing local processing performed inside membranes in transition
		P systems. In order to encode the membrane structures of transition P systems,
		additional binary data structures are needed. Such binary data structures
		are named connectivity arrays. The main purposes of the connectivity arrays
		are to distribute information about the system membrane structure among
		the different processors that implement the transition P system, and to
		facilitate communication processes among different membrane processors.
		The information kept in processor has to be versatile and compact; versatile
		means to easily permit changes in the membrane structure of the system
		processors, and compact means that not too much memory space is needed.
		Considering these two requests, a binary word of variable length is considered
		here in order to represent in membrane processors the local information
		about the membrane structures of transition P systems. This paper presents
		the abstract data type connectivity array which defines the data structure
		and the needed operations over it in order to parse the P system into a
		membrane processor tree and to keep congruent the P system membrane structure
		with the membrane processor tree. Work partially supported by contribution
		of EU commission under the Fifth Framework Programme, project MolCoNet
		IST-2001-32008.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Bernardini:WMC2003:Universality_of_Mini:03,
	author={Francesco Bernardini and Andrei Paun},
	title={Universality of Minimal Symport/Antiport: Five Membranes Suffice},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={43--54},
	abstract={P systems with symport/antiport rules of a minimal size (only one object
		passes in any direction in a communication step) have been recently proved
		to be computationally universal. The result originally reported in [2]
		has been subsequently improved in [6] by showing that six membranes suffice.
		In [6] it has been also conjectured that at least one membrane can be saved.
		Here we prove that conjecture: P systems with five membranes and symport/antiport
		rules of a minimal size are computationally complete. The optimality of
		this result remains open.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Bernar:EMCC2003:Molecular/Cellular_X:03,
	author={Francesco Bernardini and Marian Gheorghe},
	title={{Molecular/Cellular} {X} {M}achines},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Bernar:PreWMC2003:On_the_power_of_mini:03,
	author={Francesco Bernardini and Marian Gheorghe},
	title={On the power of minimal symport/antiport},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={72--83}
}

@inproceedings{Bernar:BWMC2003:Language_Generating_:03,
	author={Francesco Bernardini and Marian Gheorghe},
	title={Language Generating by Means of {P} systems with Active Membranes},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={46--60}
}

@inproceedings{Bernar:WMC-CdeA2002:P_systems_with_bound:03,
	author={Francesco Bernardini and Vincenzo Manca},
	title={{P} systems with boundary rules},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={107--118},
	abstract={We propose a new variant of P Systems, based on boundary rules , shortly
		called PB Systems. Boundary rules means that rules are not internal to
		regions but they are able to "see" even externally, that is, they are sensible
		to what happens around the border of the membranes. We prove the computational
		universality for PB systems with three membranes which sense at most one
		symbol outside and one symbol inside a membrane. Finally, we investigate
		the relationships with the basic model of P systems by proving an equivalence
		between P systems without priority, thickness or dissolution operator,
		and PB systems that use communication rules of a restricted form.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{FFreund:WMC2003:P_Systems_with_Cutti:03,
	author={Franziska Freund and Rudolf Freund and Marion Oswald and Maurice Margenstern
		and Yurii Rogozhin and Sergey Verlan},
	title={{P} systems with Cutting/Recombination Rules Assigned to Membranes},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={191--202},
	abstract={We introduce a new variant of splicing P systems, where the rules are directly
		assigned to the membranes and not to the regions as this is usually observed
		in the area of membrane systems. The strings involved in the splicing operation
		are either taken from inside or from outside the membrane and the strings
		resulting from the splicing operation also may go inside or outside the
		membrane. Instead of the splicing operation, also the operations of cutting
		and recombination are used as rules assigned to membranes. For the application
		of rules leading from one configuration of the system to the succeeding
		configuration we consider a sequential model and do not use the model of
		maximal parallelism. We will show that for such sequential P systems using
		splicing rules or cutting/recombination rules assigned to the skin membrane
		we already obtain universal computational power with only one membrane.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Cioban:WMC-CdeA2002:Client-Server_P_Syst:03,
	author={Gabriel Ciobanu and Daniel Dumitriu and Dorin Huzum and Gabriel Moruz and
		Bogdan Tanasa},
	title={Client-Server {P} systems in Modeling Molecular Interaction},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={203--218},
	abstract={We present a new version of P systems called Client-Server P Systems (CSPS).
		The client membranes are characterized by their states; the server membrane
		stores the states of the clients and triggers the corresponding interaction
		rules. We show that CSPS have the same expressive power as Turing machines.
		CSPS is used to model various molecular processes in which interaction
		and state transitions are causally linked. Signaling pathways and T cell
		activation are described by using a CSPS software environment called MOlNET
		(MOlecular NETworks). MOlNET can describe the dynamics of molecular interactions,
		including both qualitative and quantitative aspects and simulating the
		signaling pathways that tune the activation thresholds for T cells.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Cioban:PreWMC2003:A_parallel_implement:03,
	author={Gabriel Ciobanu and G. Wenyuan},
	title={A parallel implementation of transition {P} systems},
	booktitle={Pre-proceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={169--184}
}

@inproceedings{Cioban:BWMC2003:Sevilla_Carpets_Asso:03,
	author={Gabriel Ciobanu and Gheorghe P{\u a}un and Gh. Stefanescu},
	title={Sevilla Carpets Associated with {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={135--140}
}

@inproceedings{Gabriel:WMC2003:P_Systems_Running_on:03,
	author={Gabriel Ciobanu and Guo Wenyuan},
	title={{P} systems Running on a Cluster of Computers},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={123--139},
	abstract={The paper presents a parallel implementation of the membrane systems. We
		implement the simplest variant of P systems, which however defines the
		essential features of the membrane systems, and acts as a framework for
		other variants of P systems with advanced functionalities. The mechanisms
		used in this implementation could be easily adapted to other versions of
		P systems with minor changes. The implementation is designed for a cluster
		of computers; it is written in C++ and it makes use of Message Passing
		Interface as its communication mechanism.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Cioban:WMC-CdeA2002:Membrane_systems_and:03,
	author={Gabriel Ciobanu and Rahul Desai and Akash Kumar},
	title={Membrane systems and distributed computing},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={187--202},
	abstract={This paper presents membrane systems as an appropriate model for distributed
		computing, an efficient and natural environment to present the fundamental
		distributed algorithms. We support the idea that P systems can become a
		primary model for distributed computing, particularly for message-passing
		algorithms. We present the core theory, the fundamental algorithms and
		problems in distributed computing. We focus on an example describing an
		immune response system against virus attacks. The example is implemented
		using a P system library created by the authors to simulate the main functions
		of a P system, and an MPI program that takes advantage of the highly parallel
		features provided by the model. The program uses distributed leader election
		and synchronization algorithms.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Bel_En:WMC-CdeA2002:Preliminaries_About_:03,
	author={Gemma Bel-Enguix},
	title={Preliminaries About Some Possible Applications of {P} systems in Linguistics},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={74--89},
	abstract={Membrane computing [Paun, 2000] is a new and fruitful paradigm of natural
		computing. The present paper is devoted to some preliminary ideas about
		how membrane computing can be applied to linguistics. To this end, first
		some concepts are defined which introduce what we call linguistic P systems.
		Then, three examples of quite simple applications to pragmatics, phonetic
		evolution, and dialogue are discussed.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Bel_En:WMC-CdeA2002:An_Application_of_Dy:03,
	author={Gemma Bel-Enguix and Matteo Cavaliere and Rodica Ceterchi and Radu Gramatovici
		and Carlos Mart{\'i}n-Vide},
	title={An Application of Dynamic {P} systems: Generating Context-Free Languages},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={90--106},
	abstract={We present a method of generating context-free languages, in a parallel
		way, using dynamic P systems, which evolve in time in a coherent manner.
		The evolution is described by a contextual grammar D(G), which can be canonically
		associated to any context-free grammar G. The dynamic P system generated
		by D(G) will "compute" the language L(G), i.e., one of the configurations
		of the system will contain all words of L(G) of length n at depth 2n-1.
		Our approach is an attempt to prove the richness and power of the concept
		of dynamic P system, both in the area of P systems, and in the area of
		contextual grammars.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Bel-En:PreWMC2003:Active_P_automata_an:03,
	author={Gemma Bel-Enguix and Radu Gramatovici},
	title={Active {P} automata and natural language processing},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={61--71}
}

@inproceedings{Bel-Enguix:WMC2003:Parsing_with_Active_:03,
	author={Gemma Bel-Enguix and Radu Gramatovici},
	title={Parsing with Active {P} Automata},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={31--42},
	abstract={New classes of P automata are introduced corresponding to the basic classes
		of languages in the Chomsky hierarchy. Unlike the previously defined P
		automata, active P automata are computing with the structure of the membrane
		systems, using operations like membrane creation, division and dissolution.
		The model is applied to the parsing of (natural language) sentences into
		dependency trees. The research of the first author has been supported by
		Marie Curie Fellowships of the European Community programme Human Potential
		(IHP) under contract number HPMF-CT-2002-01582. The research of the second
		author has been supported by a fellowship from the NATO Scientific Committee
		in Spain.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Paun:FCT2003:Membrane_computing:03,
	author={Gheorghe P{\u a}un},
	title={Membrane computing},
	booktitle={Fundamentals of Computation Theory 14th International Symposium, FCT 2003,
		Malm{\"o}, Sweden, August 12-15, 2003, Proceedings.},
	year={2003},
	publisher={Springer},
	editor={Andrzej Lingas and Bengt J. Nilsson},
	pages={284--295},
	abstract={This is a brief overview of membrane computing, at about five years since
		this area of natural computing has been initiated. One informally introduces
		the basic ideas and the basic classes of membrane systems (P systems),
		some directions of research already well developed (mentioning only some
		central results or types of results along these directions), as well as
		several research topics which seem to be of interest.},
	series={Lecture Notes in Computer Science},
	volume={2751}
}

@inproceedings{Paun:DCFS2003:Descriptional_comple:03,
	author={Gheorghe P{\u a}un},
	title={Descriptional complexity issues in membrane computing},
	booktitle={Proc. of DCFS Workshop},
	year={2003},
	address={Budapest, Hungary},
	pages={66--77}
}

@inproceedings{Franco:EMCC2003:Modeling_some_Biolog:03,
	author={Giuditta Franco and Vincenzo Manca},
	title={Modeling some Biological Phenomena by {P} systems},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Franco:WMC2003:A_Membrane_System_fo:03,
	author={Giuditta Franco and Vincenzo Manca},
	title={A Membrane System for the Leukocyte Selective Recruitment},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={181--190},
	abstract={A formal description is developed for the phenomenon of leukocyte recruitment
		that plays a critical role in the immune response. Due to its complex nature
		and capability to rapidly adapt to the attack of infectious agents, the
		immune system may be considered a typical example of complex adaptive system
		[9]. Here the leukocyte selective recruitment, crucial in immunity, is
		modeled as a dynamical system of interactions between leukocytes and endothelial
		cells, where a special kind of membrane structure turns out to be a very
		useful tool in the formal analysis of the recruitment process. In our membrane
		system, besides the traditional rules for communication and transformation
		of P systems [8], rules are allowed for the expression of receptors, for
		adhesion between membranes, and for the encapsulation of a membrane inside
		another membrane.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Franco:PreWMC2003:A_membrane_system_fo:03,
	author={Giuditta Franco and Vincenzo Manca},
	title={A membrane system for the leucocyte selective recruitment},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={222--230.}
}

@inproceedings{Hoogeboom:DLT2002:,
	author={Hendrik Jan Hoogeboom},
	title={Carriers and counters. {P} systems with carriers vs. (blind) counter automata},
	booktitle={Developments in Language Theory, 6th International Conference, DLT 2002,
		Kyoto, Japan, September 18-21, 2002, Revised Papers},
	year={2003},
	publisher={Springer-Verlag Heidelberg},
	editor={Masami Ito and Masafumi Toyama},
	pages={140--151},
	abstract={P systems with carriers are shown to be computationally complete with only
		a single membrane and two carriers. We argue that their power is due to
		the maximal parallelism required in the application of the rules. In fact,
		with a single carrier, these systems are equivalent to blind counter automata.
		Finally, with a single passenger restriction the systems are again computationally
		complete.},
	series={Lecture Notes In Computer Science},
	volume={2450}
}

@inproceedings{Arde:WMC-CdeA2002:Molecular_Biology_of:03,
	author={Ioan I. Ardelean},
	title={Molecular Biology of Bacteria and its Relevance for {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={1--18},
	abstract={We recall several elements of molecular biology of bacteria, also discussing
		their (possible) relevance for the membrane computing area.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Arde:BWMC2003:Mechanosensitive_Cha:03,
	author={Ioan I. Ardelean and Daniela Besozzi},
	title={Mechanosensitive Channels, a Hot Topic in (Micro){B}iology: any Excitement
		for {P} systems?},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={32--36}
}

@inproceedings{Arde:BWMC2003:Playing_with_a_Proba:03,
	author={Ioan I. Ardelean and Matteo Cavaliere},
	title={Playing with a Probabilistic {P} system Simulator: {M}athematical and Biological
		Problems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={37--45}
}

@inproceedings{Gia:WMC-CdeA2002:Accretive_rules_in_C:03,
	author={Jean-Louis Giavitto and Olivier Michel},
	title={Accretive rules in {Cayley} {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={319--338},
	abstract={During a discussion taking place at WMC'01, G. Paun put the question of
		what could be computed only by moving symbols between membranes. In this
		paper we provide some elements of the answer, in a setting similar to tissue
		P systems, where the set of membranes is organized into a finite graph
		or into a Cayley graph, and using a very simple propagation process characterizing
		accretive growth. Our main result is to characterize the final configuration
		as a least fixed point and to establish two series of approximations that
		converge to it. All the notions introduced (Cayley graph of membranes,
		accretive rule and iteration) have been implemented in the MGS programming
		language and the two approximation series can be effectively computed in
		Pressburger arithmetics using the omega calculator in the case of Abelian
		Cayley graphs.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Semper:WMC2003:P_Systems_with_Exter:03,
	author={Jose M. Sempere},
	title={{P} systems with External Input and Learning Strategies},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={341--356},
	abstract={This is a preliminary work in which we propose a variant of P systems by
		adding in every region a dynamic engine that allows the change of the internal
		rewriting rules along the computation time, obtaining in this way a new
		family of P systems with adaptation to changing environments. They will
		be called adaptative P systems. Here, the engine that we propose to act
		inside every membrane is based on learning algorithms under the grammatical
		inference framework. The behavior of every region changes according to
		the information received from the external environment and the internal
		regions.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Semp:PreWMC2003:P_systems_with_exter:03,
	author={Jos{\'e} M. Sempere},
	title={{P} systems with external input and learning strategies},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={445--448}
}

@inproceedings{Pazos:IWANN2003:Solving_SAT_in_linea:03,
	author={Juan Pazos and Alfonso Rodr{\'i}guez-Pat{\'o}n and Andr{\'e}s Silva},
	title={Solving {SAT} in linear time with a neural-like membrane system},
	booktitle={Artificial Neural Nets. Problem Solving Methods 7th International Work-Conference
		on Artificial and Natural Neural Networks, IWANN 2003, Ma{\'o}, Menorca, Spain,
		June 3-6. Proceedings, Part II.},
	year={2003},
	publisher={Springer},
	editor={Jos{\'e} Mira and Jos{\'e} R. Alvarez},
	pages={662--669},
	abstract={We present in this paper a neural-like membrane system solving the SAT problem
		in linear time. These neural P systems are nets of cells working with multisets.
		Each cell has a finite state memory, processes multisets of symbol-impulses,
		and can send impulses ("excitations") to the neighboring cells. The maximal
		mode of rules application and the replicative mode of communication between
		cells are at the core of the efficiency of these systems.},
	series={Lecture Notes in Computer Science},
	volume={2687}
}

@inproceedings{SDer:WMC2003:P_Systems_Generating:03,
	author={K. S. Dersanambika and Kamala Krithivasan and K. G. Subramanian},
	title={{P} systems Generating Hexagonal Picture Languages},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={168--180},
	abstract={P systems generating rectangular arrays have been recently introduced in
		[1,2,3], thus bringing together the two areas of theoretical computer science,
		namely membrane computing and picture grammars. In this paper, hexagonal
		arrays on triangular grids are considered and the capabilities of the three
		approaches [1,2,3] that construct P systems for generation of arrays on
		rectangular grids, to handle arrays on triangular grids, are demonstrated.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Ders:PreWMC2003:P_systems_generating:03,
	author={K.S. Dersanambika and Kamala Krithivasan and K.G. Subramanian},
	title={{P} systems generating hexagonal picture languages},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={209--221}
}

@inproceedings{Krithi:BWMC2003:P_Automata_with_Tape:03,
	author={Kamala Krithivasan},
	title={{P Automata} with Tapes},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={216--225}
}

@inproceedings{Lakshm:PreWMC2003:On_the_power_of_tiss:03,
	author={Kuppuswamy Lakshmanan and Raghavan Rama},
	title={On the power of tissue {P} systems with insertion and deletion rules},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={304--318}
}

@inproceedings{Cienci:PreWMC2003:P_automata_with_prio:03,
	author={Ludek Cienciala and Lucie Ciencialova},
	title={{P} automata with priorities},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={161--168}
}

@inproceedings{Kudlek:WMC-CdeA2002:Considerations_on_a_:03,
	author={Manfred Kudlek and Victor Mitrana},
	title={Considerations on a Multiset Model for Membrane Computing},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={352--359},
	abstract={We define, in an inductive way, structured multisets, as well as Chomsky-like
		productions for such higher order multisets. The usefulness of the approach
		for Petri nets and membrane computing is briefly discussed.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Gheorg:IWANN2003:An_agent_based_appro:03,
	author={Marian Gheorghe and Carlos Mart{\'i}n-Vide and Victor Mitrana and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={An agent based approach of collective foraging},
	booktitle={Artificial Neural Nets. Problem Solving Methods 7th International Work-Conference
		on Artificial and Natural Neural Networks, IWANN 2003, Ma{\'o}, Menorca, Spain,
		June 3-6. Proceedings, Part II.},
	year={2003},
	publisher={Springer},
	editor={Jos{\'e} Mira and Jos{\'e} R. Alvarez},
	pages={639--645},
	abstract={In this paper the behaviour of a bee colony is modeled as a society of communicating
		agents acting in parallel and synchronizing their behaviour. Two computational
		models for defining the agents behaviour are introduced and compared and
		tools developed for these models are briefly illustrated.},
	series={Lecture Notes in Computer Science},
	volume={2687}
}

@inproceedings{Gheorg:FBCI2003:Eilenberg_P_systems::03,
	author={Marian Gheorghe and Mike Holcombe and Petros Kefalas},
	title={Eilenberg {P} systems: a bio-computational model},
	booktitle={Proc. First Balkan Conf. on Informatics},
	year={2003},
	address={Thessaloniki, Greece},
	pages={147--160}
}

@inproceedings{Pere:PreWMC2003:A_linear-time_soluti:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={A linear-time solution for the {Knapsack} problem using active membranes},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={326--342}
}

@inproceedings{PerezJ:WMC2003:A_Linear-Time_Soluti:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={A Linear-Time Solution to the {Knapsack} Problem Using {P} systems with
		Active Membranes},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={250--268},
	abstract={Up to now, P systems dealing with numerical problems have been rarely considered
		in the literature. In this paper we present an effective solution to the
		Knapsack problem using a family of deterministic P systems with active
		membranes using 2-division. We show that the number of steps of any computation
		is of linear order, but polynomial time is required for pre-computing resources.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Pere:BWMC2003:Complexity_Classes_i:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Complexity Classes in Cellular Computing with Membranes},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={270--278},
	abstract={In this paper we introduce four complexity classes for cellular computing
		systems with membranes: the first and the second ones contain all decision
		problems solvable in polynomial time by a family of deterministic P systems,
		without and with an input membrane, respectively; the third and fourth
		classes contain all decision problems solvable in polynomial time by a
		family of non-deterministic P systems, without and with an input membrane,
		respectively. We illustrate the usefulness of these classes by solving
		two NP�complete problems, namely HPP and SAT, in both variants of P systems.}
}

@inproceedings{Pere:BWMC2003:Solving_VALIDITY_Pro:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Solving {VALIDITY} Problem by Active Membranes with Input},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={279--290}
}

@inproceedings{PerezJ:WMC-CdeA2002:Decision_P_Systems_a:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Decision {P} systems and the {P} $ \neq $ {NP} Conjecture},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={388--399},
	abstract={We introduce decision P systems, which are a class of P systems with symbol-objects
		and external output. The main result of the paper is the following: if
		there exists an NP-complete problem that cannot be solved in polynomial
		time, with respect to the input length, by a deterministic decision P system
		constructed in polynomial time, then $P \neq NP$. From Zandron-Ferreti-Mauri's
		theorem it follows that if $P \neq NP$, then no NP-complete problem can
		be solved in polynomial time, with respect to the input length, by a deterministic
		P system with active membranes but without membrane division, constructed
		in polynomial time from the input. Together, these results give a characterization
		of $P \neq NP$ in terms of deterministic P systems.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Pere:BWMC2003:Verification_of_non-:03,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={Verification of non-deterministic transition {P} systems solving {SAT} problem},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={291--304}
}

@inproceedings{Oswald:SALR2003:P_Automata_with_memb:03,
	author={Marion Oswald and Rudolf Freund},
	title={{P Automata} with membrane channels},
	booktitle={Proceedings of the eighth Int. Symp. on Artificial Life and Robotics},
	year={2003},
	address={Beppu, Japan},
	editor={M. Sugisaka and H. Tanaka},
	pages={275--278}
}

@inproceedings{Cavali:WMC-CdeA2002:Evolution-Communicat:03,
	author={Matteo Cavaliere},
	title={Evolution-Communication {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={134--145},
	abstract={We propose a new class of P systems that use simple evolution rules (classical
		evolution rules without communication targets) and symport/antiport rules
		(for communication). This type of P system is realistic for (at least)
		three different reasons: we do not have target indications in the evolution
		rules, we use very simple symport/antiport rules to realize communication,
		and we do not need objects available in the environment at the beginning
		of a computation. Somewhat expected, this new variant is still universal.
		We prove the universality in two cases: when using catalytic rules (but
		only one catalyst), symport/antiport rules of weight one, and two membranes,
		and when we use three membranes, symport/antiport rules of weight one,
		and no catalyst. Especially the latter result is of interest, because the
		catalysts were used in most universality proofs for P systems with symbol-objects.
		Also new is the proof technique we use: we start from programmed grammars
		with unconditional transfer.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Cavali:BWMC2003:Forbidding_and_Enfor:03,
	author={Matteo Cavaliere and Natasha Jonoska},
	title={Forbidding and Enforcing in Membrane Computing},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={75--84}
}

@inproceedings{Cavali:PreWMC2003:Evolution_and_observ:03,
	author={Matteo Cavaliere and Peter Leupold},
	title={Evolution and observation - a new way to look at membrane systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={117--132}
}

@inproceedings{Cavaliere:WMC2003:Evolution_and_Observ:03,
	author={Matteo Cavaliere and Peter Leupold},
	title={Evolution and Observation: A New Way to Look at Membrane Systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={70--87},
	abstract={An architecture for investigating the dynamical behaviour of biological
		systems is proposed by using the concepts of behaviour and observer. The
		behaviour of a biological system is the sequence of states traversed as
		time passes; the observer is a device translating this behaviour into a
		readable output. As an instance of this architecture we investigate P/O
		systems constituted by a membrane system and a multiset finite automaton
		observer. We first characterize the infinite behaviours of conservative
		systems, i.e., systems whose number of objects is constant. These systems
		behave very regularly. For more sophisticated systems we then use also
		more complicated multiset automata as observers: they map the configurations
		into an output alphabet and thus we obtain words describing the entire
		computations. Even for seemingly simple membrane systems using only non-cooperative
		rules and regular-like observers through this combination a great power
		emerges, in our case computational universality.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Margenstern:WMC2003:Can_Hyperbolic_Geome:03,
	author={Maurice Margenstern},
	title={Can Hyperbolic Geometry Be of Help for {P} systems?},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={240--249},
	abstract={The goal of this paper is to propose a possible new approach to P systems
		by making use of hyperbolic geometry. The ideas of the paper are a continuation
		of the ideas which the author presented at the Brainstorming meeting organised
		in Tarragona, Spain, on February 5-12, 2003. The hope of this approach
		is that this could be of some help in order to better understand the computational
		power of Nature.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Margen:PreWMC2003:Can_hyperbolic_geome:03,
	author={Maurice Margenstern},
	title={Can hyperbolic geometry be of help for {P} systems?},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={319--325.}
}

@inproceedings{Margen:BWMC2003:Can_Hyperbolic_Geome:03,
	author={Maurice Margenstern},
	title={Can Hyperbolic Geometry Help Molecular Computing?},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={226--231}
}

@inproceedings{Guti:EMCC2003:Solving_Numerical_NP:03,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Solving Numerical {NP}-Complete Problems Using {P} systems with Active membranes:
		the Partition Problem and Beyond},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Ionescu:DNA8:Unexpected_Universal_Results:2003,
	author={Mihai Ionescu and Carlos Mart{\'i}n-Vide and Andrei P{\u a}un and Gheorghe P{\u a}un},
	title={Unexpected Universality Results for Three Classes of {P} systems with Symport/Antiport},
	booktitle={DNA Computing: 8th International Workshop on DNA-Based Computers, DNA8 Sapporo,
		Japan, June 10-13, 2002. Revised Papers},
	year={2003},
	publisher={Springer-Verlag Heidelberg},
	editor={M. Hagiya and A. Ohuchi},
	pages={281--290},
	abstract={Symport and antiport are biological ways of transporting molecules through
		membranes in "collaborating" pairs; in the case of symport the two molecules
		pass in the same direction, in the case of antiport the two molecules pass
		in opposite directions. Here we first survey the results about the computing
		power of membrane systems (P systems) using only symport/antiport rules
		(hence these systems compute only by using communication), then we introduce
		a novel way of defining the result of a computation in a membrane system:
		looking for the trace of certain objects in their movement through membranes.
		Rather unexpected, in this way we get characterizations of recursively
		enumerable languages by means of membrane systems with symport/antiport
		which work with multisets of objects (note the qualitative difference between
		the data structure used by computations - multisets: no ordering - and
		the data structure of the output - strings: linear ordering). A similar
		remark holds true for the case of analysing P systems: the sequence of
		certain distinguished objects taken from the environment during a computation
		is the string recognized by the computation. We also survey universality
		results from this area, with sketched proofs.},
	series={Lecture Notes In Computer Science},
	volume={2568}
}

@inproceedings{Madhu:BWMC2003:New_Results_in_Rewri:03,
	author={Mutyam Madhu},
	title={New Results in Rewriting {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={232--240}
}

@inproceedings{Madhu:WMC-CdeA2002:A_Survey_on_Some_Var:03,
	author={Mutyam Madhu and Kamala Krithivasan},
	title={A Survey on Some Variants {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={360--370},
	abstract={In this paper we give a brief survey of some variants of P systems and their
		computational capacity. An improvement of a known result about rewriting
		P systems with leftmost derivation is given. We also give the generalized
		definition for normal forms of rewriting P systems.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Ibar:PreWMC2003:The_number_of_membra:03,
	author={Oscar H. Ibarra},
	title={The number of membranes matters},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={273--285}
}

@inproceedings{Ibarra:WMC2003:The_Number_of_Membra:03,
	author={Oscar H. Ibarra},
	title={The Number of Membranes Matters},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={218--231},
	abstract={We look at a restricted model of a communicating P system, called RCPS,
		whose environment does not contain any object initially. The system can
		expel objects into the environment but only expelled objects can be retrieved
		from the environment. Such a system is initially given an input (with each
		i j representing the multiplicity of distinguished object a i , ) and is
		used as an acceptor. We show that RCPSs are equivalent to two-way multihead
		finite automata over bounded languages (i.e., subsets of , for some distinct
		symbols ). We then show that there is an infinite hierarchy of RCPSs in
		terms of the number of membranes. In fact, for every r, there is an s>
		r and a unary language L accepted by an RCPS with s membranes that cannot
		be accepted by an RCPS with r membranes. This provides an answer to an
		open problem in [12] which asks whether there is a nonuniversal model of
		a membrane computing system which induces an infinite hierarchy on the
		number of membranes. We also consider variants/generalizations of RCPSs,
		e.g., acceptors of languages; models that allow a polynomial bounded supply
		of objects in the environment initially; models with tentacles, etc. We
		show that they also form an infinite hierarchy with respect to the number
		of membranes (or tentacles). The proof techniques can be used to obtain
		similar results for other restricted models of P systems, like symport/antiport
		systems This research was supported in part by NSF Grants IIS-0101134 and
		CCR02-08595.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Ibarra:MFCS2003:Characterizations:2003,
	author={Oscar H. Ibarra and Zhe Dang and Omer Egecioglu and Gaurav Saxena},
	title={Characterizations of Catalytic Membrane Computing Systems (Extended Abstract)},
	booktitle={Mathematical Foundations of Computer Science 2003: 28th International Symposium,
		MFCS 2003, Bratislava, Slovakia, August 25-29, 2003, Proceedings},
	year={2003},
	month={December},
	publisher={Springer-Verlag Heidelberg},
	editor={Branislav Rovan, Peter Vojt{\'a}�},
	pages={480--489},
	abstract={We look at 1-region membrane computing systems which only use rules of the
		form , where C is a catalyst, a is a noncatalyst, and v is a (possibly
		null) string of noncatalysts. There are no rules of the form . Thus, we
		can think of these systems as purely catalytic. We consider two types:
		(1) when the initial configuration contains only one catalyst, and (2)
		when the initial configuration contains multiple (not necessarily distinct)
		catalysts. We show that systems of the first type are equivalent to communication-free
		Petri nets, which are also equivalent to commutative context-free grammars.
		They define precisely the semilinear sets. This partially answers an open
		question in [19]. Systems of the second type define exactly the recursively
		enumerable sets of tuples (i.e., Turing machine computable). We also study
		an extended model where the rules are of the form (where q and p are states),
		i.e., the application of the rules is guided by a finite-state control.
		For this generalized model, type (1) as well as type (2) with some restriction
		correspond to vector addition systems.},
	series={Lecture Notes In Computer Science},
	volume={2747}
}

@inproceedings{Sosík:BWMC2003:Solving_a_PSPACE-Com:03,
	author={Petr Sosik},
	title={Solving a {PSPACE}-{C}omplete {P}roblem by {P} systems with Active Membranes},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={305--312}
}

@inproceedings{Sosik:WMC-CdeA2002:P_Systems_Without_Pr:03,
	author={Petr Sosik and Rudolf Freund},
	title={{P} systems Without Priorities are Computationally Universal},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={400--409},
	abstract={The "classical" model of P systems was introduced by Gheorghe Paun in 1998;
		this model with symbol objects was shown to be computationally universal
		in [8], provided that catalysts and priorities of rules are used. We now
		show by reduction via register machines that the priorities may be omitted
		from the model without loss of computational power. As a consequence, several
		universality results for P systems in [10] are improved.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Frisco:WMC-CdeA2002:Simulating_counter_a:03,
	author={Pierluigi Frisco and Hendrik Jan Hoogeboom},
	title={Simulating counter automata by {P} systems with symport/antiport},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={288--301},
	abstract={The complexity, expressed in number of membranes and weight of rules, of
		P systems with symport/antiport generating recursively enumerable sets
		is reduced if counter automata instead of matrix grammars are simulated.
		We consider both subsets of $\mathbb{N}$ obtained by counting objects in
		a designated membrane, and string languages obtained by following the traces
		of a designated object.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Frisco:WMC-CdeA2002:Towards_a_Hierarchy_:03,
	author={Pierluigi Frisco and Sungchul Ji},
	title={Towards a Hierarchy of Conformons-{P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={302--318},
	abstract={The combination of a theoretical model of the living cell and membrane computing
		suggested a new variant of a computational model called conformons-P system
		based on membrane-enclosed compartments where conformon-like objects evolve.
		Some variants of such model are presented and their computational power
		is sketched.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Ceterc:BWMC2003:P_Systems_with_Commu:03,
	author={Rodica Ceterchi and Carlos Mart{\'i}n-Vide},
	title={{P} systems with Communication for Static Sorting},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={101--117}
}

@inproceedings{Ceterc:WMC-CdeA2002:Dynamic_P_systems.:03,
	author={Rodica Ceterchi and Carlos Mart{\'i}n-Vide},
	title={Dynamic {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={146--186},
	abstract={We propose in this paper a uniform manner of generating families of P systems,
		using contextual grammars, specifically, variants of bracketed contextual
		grammars. We introduce the concept of enriched bracketed contextual grammar,
		which can be used to generate families of P systems with symport/antiport
		rules. More generally, we define the notion of dynamic P system associated
		to grammars able to "generate" families of P systems, and introduce the
		notion of dynamic computation sequence, which combines the previous generative
		approach with computational aspects. We illustrate these notions with an
		application to the problem of sorting. The model of sorting we propose
		uses symport/antiport rules with priority relations, and the notion of
		stable configuration of a P system.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Ceterchi_:WMC2003:Simulating_Boolean_C:03,
	author={Rodica Ceterchi and Dragos Sburlan},
	title={Simulating Boolean Circuits with {P} systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={104--122},
	abstract={We propose a model for simulating Boolean circuits with P systems. The simulation
		is done in two steps, by first simulating the gates of such a circuit,
		and next by showing how these can be combined to obtain actual circuits.
		The type of P systems used is with symbol objects, context-free rewriting
		rules and some other features like mobile catalysts, weak priorities and
		promoters.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Ceterc:PreWMC2003:Simulating_Boolean_c:03,
	author={Rodica Ceterchi and Dragos Sburlan},
	title={Simulating Boolean Circuits with {P} systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={145--160}
}

@inproceedings{Ceterc:BWMC2003:Array-rewriting_P_sy:03,
	author={Rodica Ceterchi and Mutyam Madhu and Gheorghe P{\u a}un and K.G. Subramanian},
	title={Array-rewriting {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={118--134}
}

@inproceedings{Ceterchi_:WMC2003:Tiling_Rectangular_P:03,
	author={Rodica Ceterchi and Radu Gramatovici and Natasa Jonoska},
	title={Tiling Rectangular Pictures with {P} systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={88--103},
	abstract={We introduce a class of two-dimensional tiling languages which are distinct
		from the local and recognizable picture languages. These languages arise
		from tilings of the integer lattice Z 2. For such picture languages, we
		define a class of tissue-like P systems with active membranes as a generative
		device. We also make a comparison with the model introduced in [2,3] for
		the generation of local and recognizable two-dimensional languages, using
		a similar type of P systems. The first author has been supported by the
		grant SAB2000-0145, from the Secretaria de Estato de Educacion y Universidades,
		of the Spanish Ministry for Education, Culture, and Sport. The second author
		has been supported by a fellowship of the NATO Scientific Committee. The
		third author has been partially supported by grants EIA-0086015 and EIA-0074808
		from the National Science Foundation, USA.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Ceterc:PreWMC2003:P_systems_for_tiling:03,
	author={Rodica Ceterchi and Radu Gramatovici and Natasha Jonoska},
	title={{P} systems for tiling rectangular pictures},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={133--144}
}

@inproceedings{Ceterc:BWMC2003:Generating_Picture_L:03,
	author={Rodica Ceterchi and Radu Gramatovici and Natasha Jonoska and K.G. Subramanian},
	title={Generating Picture Languages with {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={85--100}
}

@inproceedings{Vasilc:WMC-CdeA2002:The_Architecture_for:03,
	author={Roxana Vasilco and Alina Popescu and Roxandra Chiurtu and Dan Dascalu},
	title={The Architecture for Living Structures - A Possible Basis for Molecular
		Computing},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={410--421},
	abstract={The paper recalls basic biological facts about living structures, as useful
		supports for molecular computing. Particular emphasis is made on membranes
		and proteins, whose structural and conformational dynamics might be considered
		as generating a computational environment in living systems.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Freund:WMC-CdeA2002:Energy-controlled_P_:03,
	author={Rudolf Freund},
	title={Energy-controlled {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={247--260},
	abstract={As already considered in [13], we investigate P systems where each evolution
		rule "produces" or "consumes" some quantity of energy, in amounts which
		are expressed as integer numbers. Yet in contrast to P systems with energy
		accounting as considered in [13], for energy-controlled P systems we demand
		that in each evolution step and in each membrane the total energy consumed
		by the application of a multiset of evolution rules has to be the maximum
		possible within a specific non-negative range. Only equipped with this
		control feature, energy-controlled P systems are very powerful. In the
		case of multisets of symbol objects we find that energy-controlled P systems
		with even only one membrane and an energy range of $\left\{ 0,1\right\}
		$ for the total energy involved in an evolution step characterize the recursively
		enumerable sets of vectors of natural numbers (without using catalysts
		or priorities or membrane dissolving features). In the case of string objects
		similar results can be obtained. Energy-controlled P systems with even
		only one membrane and the minimal energy range of $\left\{ 0\right\} $
		for the total energy involved in an evolution step at least generate any
		set of vectors of natural numbers that can be generated by matrix grammars
		without appearance checking.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Freund:WMC-CdeA2002:Membrane_Systems_wit:03,
	author={Rudolf Freund and Andrei P{\u a}un},
	title={Membrane Systems with Symport/Antiport: Universality Results},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={270--287},
	abstract={Symport and antiport are biological ways for transporting molecules through
		membranes in a "collaborating" manner; in the case of symport several molecules
		pass in the same direction, in the case of antiport two or more molecules
		pass in opposite directions. In this paper we first survey the results
		on the computing power of membrane systems (P systems) using only symport/antiport
		rules and then improve some of the results known so far. A recent variant
		of P systems with purely communicating rules introduced in [24] with the
		name of communicating P systems is revisited and optimal (with respect
		to the number of membranes) universality results for that particular variant
		are obtained, too.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Freund:DLT2003:On_tree_classes_automata_like:2003,
	author={Rudolf Freund and Carlos Mart{\'i}n-Vide and Adam Obtulowicz and Gheorghe P{\u a}un},
	title={On Three Classes of Automata-Like {P} systems},
	booktitle={Developments in Language Theory, 7th International Conference, DLT 2003,
		Szeged, Hungary, July 7-11, 2003, Proceedings},
	year={2003},
	publisher={Springer-Verlag Heidelberg},
	editor={Zolt{\'a}n {\'E}sik and Zolt{\'a}n F{\"u}l{\"o}p},
	pages={292--303},
	abstract={We investigate the three classes of accepting P systems considered so far,
		namely the P automata of Csuhaj-Varj{\'u}, Vaszil [3], their variant introduced
		by Madhu, Krithivasan [10], and the related machinery of Freund, Oswald
		[5]. All three variants of automata-like P systems are based on symport/antiport
		rules. For slight variants of the first two classes we prove that any recursively
		enumerable language can be recognized by systems with only two membranes
		(this considerably improves the result from [3], where systems with seven
		membranes were proved to be universal). We also introduce the initial mode
		of accepting strings (the strings are introduced into the system, symbol
		by symbol, at the beginning of a computation), and we briefly investigate
		this mode for the three classes of automata, especially for languages over
		a one-letter alphabet. Some open problems are formulated, too.},
	series={Lecture Notes In Computer Science},
	volume={2710}
}

@inproceedings{Freund:PreWMC2003:P_systems_with_condi:03,
	author={Rudolf Freund and Marion Oswald},
	title={{P} systems with conditional communication rules assigned to membranes},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={231--240}
}

@inproceedings{Freund:BWMC2003:P_Systems_with_Eleme:03,
	author={Rudolf Freund and Marion Oswald},
	title={{P} systems with Elementary Graph Productions},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={180--188}
}

@inproceedings{Freund:WMC-CdeA2002:P_systems_with_Activ:03,
	author={Rudolf Freund and Marion Oswald},
	title={{P} systems with Activated/Prohibited Membrane Channels},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={261--269},
	abstract={We investigate a variant of purely communicating P systems, where multisets
		of activators can open channels for certain objects to pass through membranes
		in one direction; however, the permeability of a channel can be controlled
		by multisets of prohibitors, too. We will show that for such systems with
		only one membrane and using only singleton activator and prohibitor sets,
		we already obtain universal computational power. When using systems with
		activating multisets for membrane channels only, we obtain a similar result.
		By showing a close correspondence to P systems with symport/antiport as
		introduced in [13] we can optimize some results given there.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Freund:EMCC2003:Complexity_of_P_Auto:03,
	author={Rudolf Freund and Marion Oswald},
	title={Complexity of {P} Automata with Catalysts},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Freund:PreWMC2003:P_systems_with_cutti:03,
	author={Rudolf Freund and Marion Oswald and Franziska Freund and Maurice Margenstern
		and Sergey Verlan and Yurii Rogozhin},
	title={{P} systems with cutting/recombination rules assigned to membranes},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={241--251}
}

@inproceedings{Freund:PreWMC2003:Omega-P_automata_wit:03,
	author={Rudolf Freund and Marion Oswald and Ludwig Staiger},
	title={{Omega-P} automata with communication rules},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={252--265}
}

@inproceedings{RFreund:WMC2003:omega-P_Automata_wit:03,
	author={Rudolf Freund and Marion Oswald and Ludwig Staiger},
	title={{omega-P} Automata with Communication Rules},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={203--217},
	abstract={We introduce omega-P automata based on the model of P systems with membrane
		channels (see [8]) using only communication rules. We show that omega-P
		automata with only two membranes can simulate the computational power of
		usual (non-deterministic) omega-Turing machines. A very restricted variant
		of omega-P automata allows for the simulation of omega-finite automata
		in only one membrane.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Verlan:WMC2003:About_Splicing_P_Sys:03,
	author={Sergey Verlan},
	title={About Splicing {P} systems with Immediate Communication and Non-extended
		Splicing {P Systems}},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={369--382},
	abstract={We consider splicing P systems with immediate communication introduced by
		Gh. Pun in [5]. We solve the open problem Q17 from that book by proving
		that systems with two membranes can generate any recursively enumerable
		language. We discuss the similarities between splicing P systems with immediate
		communication having two membranes and time-varying distributed H systems
		with two components. We also consider non-extended splicing P systems,
		i.e., without a terminal alphabet. We show that it is possible to generate
		any recursively enumerable language by such systems with two membranes.
		In this way we solve the open problem Q16 from the same book.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Verlan:EMCC2003:Communicating_Distri:03,
	author={Sergey Verlan},
	title={Communicating Distributed {H Systems} with Alternating Filters and Tissue
		{P} systems with Minimal Symport/Antiport},
	booktitle={EMCC Workshop},
	year={2003},
	month={November},
	address={Vienna}
}

@inproceedings{Verlan:PreWMC2003:About_splicing_P_sys:03,
	author={Sergey Verlan},
	title={About splicing {P} systems with immediate communication and non-extended
		splicing {P Systems}},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={461--473.}
}

@inproceedings{Kris:BWMC2003:Some_Universality_Re:03,
	author={Shankara-Narayanan Krishna and Andrei P{\u a}un},
	title={Some Universality Results on Evolution-Communication {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={207--215}
}

@inproceedings{Kris:BWMC2003:Three_Universality_R:03,
	author={Shankara-Narayanan Krishna and Andrei P{\u a}un},
	title={Three Universality Results on {P} systems},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={198--206}
}

@inproceedings{Kris:WMC-CdeA2002:Tissue_P_systems_wit:03,
	author={Shankara-Narayanan Krishna and Kuppuswamy Lakshmanan and Raghavan Rama},
	title={Tissue {P} systems with contextual and rewriting rules},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={339--351},
	abstract={The study of tissue P systems was initiated in [6], inspired from the way
		neurons cooperate, processing impulses in the complex net established by
		synapses. These systems use multisets of objects for processing, and it
		was shown that computational completeness can be achieved using a small
		number of cells and states. In this paper, we use string objects as the
		underlying data structure. The control structure used is a restricted form
		of contextual rules and rewriting rules. We obtain two characterizations
		of recursively enumerable languages using these systems: ${\rm tP}$ systems
		having 2 states and 2 cells as well as ${\rm tP}$ systems having 4 states
		and a single cell generate all recursively enumerable languages. We also
		discuss the relationships with ET0L and E0L languages.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Dal-Zilio:WMC2003:On_the_Dynamics_of_P:03,
	author={Silvano Dal-Zilio and Enrico Formenti},
	title={On the Dynamics of {PB Systems}: A {Petri} Net View},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={153--167},
	abstract={We study dynamical properties of PB systems, a new computational model of
		biological processes, and propose a compositional encoding of PB systems
		into Petri nets. Building on this relation, we show that three properties:
		boundedness, reachability and cyclicity, which we claim are useful in practice,
		are all decidable.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Dal_Zi:PreWMC2003:On_the_dynamics_of_P:03,
	author={Silvano Dal-Zilio and Enrico Formenti},
	title={On the dynamics of {PB systems}},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={197--208}
}

@inproceedings{Marcus:WMC-CdeA2002:Bridging_P_Systems_a:03,
	author={Solomon Marcus},
	title={Bridging {P} systems and Genomics: A Preliminary Approach},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={371--376},
	abstract={Bringing genomics within the framework of P systems could give to the former
		the possibility to take profit of the computational capacities of the latter.
		Moreover, suggestions coming from genomics could enrich the study of P
		systems with new biological and computational ideas. In what follows, a
		first attempt is made in this respect.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Ji:BWMC2003:Towards_a_Unified_Th:03,
	author={Sungchul Ji},
	title={Towards a Unified Theory of Computing, Mind, and Signs},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={189--197}
}

@inproceedings{Balane:WMC-CdeA2002:Eilenberg_P_Systems:03,
	author={Tudor Balanescu and Marian Gheorghe and Mike Holcombe and Florentin Ipate},
	title={{Eilenberg} {P} systems},
	booktitle={Membrane Computing: International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002. Revised Papers.},
	year={2003},
	month={July},
	publisher={Springer-Verlag, Berlin},
	address={Curtea de Arges, Romania},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	pages={43--57},
	abstract={A class of P systems, called EP systems, with string objects processed by
		evolution rules distributed alongside the transitions of an Eilenberg machine,
		is introduced. A parallel variant of EP systems, called EPP systems, is
		also defined and the power of both EP and EPP systems is investigated in
		relationship with three parameters: number of membranes, states and set
		of distributed rules. It is shown that EPP systems represent a promising
		framework for solving NP-complete problems. In particular linear time solutions
		are provided for the SAT problem.},
	series={Lecture Notes in Computer Science},
	volume={2597}
}

@inproceedings{Paka:PreWMC2003:On_the_power_of_tiss:03,
	author={V.J. Pakash},
	title={On the power of tissue {P} systems working in the maximal-one mode},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={356--364}
}

@inproceedings{ladimi:WMC2003:Simulation_of_Mobile:03,
	author={Vladimir Rogozhin and Elena Boian},
	title={Simulation of Mobile Ambients by {P} systems. {P}art 1},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={304--319},
	abstract={Ambient calculus is an abstract model of the basic features of distribution
		and mobility of the computing and computation. The central notion of ambient
		calculus is that of a mobile ambient, which is a bounded place where a
		computation happens. It was shown that a P system with symbol-objects with
		membrane dissolution can be expressed in ambient calculus. We want to do
		here the converse work: to express ambient calculus in membrane computing.
		In this paper we present the first part of this work: we show that the
		Ethernet Network (local electronic computer network) can be expressed in
		terms of P systems with symbol-objects. Work is supported by NATO project
		PST.CLG.976912, MolCoNet project IST-2001-32008, CRDF (The U.S. Civilian
		Research and Development Foundation) project, BGP-II Award No. MM2-3034.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Rogozh:PreWMC2003:Simulation_of_mobile:03,
	author={Vladimir Rogozhin and Elena Boian},
	title={Simulation of mobile ambients by {P} systems. {Part} 1},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={404--427}
}

@inproceedings{Suzuki:BWMC2003:Abstract_Rewriting_S:03,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={Abstract Rewriting Systems on Multisets and Their Application for Modelling
		Complex Behaviours},
	booktitle={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003},
	month={February 5-11},
	address={Tarragona},
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={313--331}
}

@inproceedings{Suzuki:PreWMC2003:Modeling_the_p53_sig:03,
	author={Yasuhiro Suzuki and S. Ogishima and Hiroshi Tanaka},
	title={Modeling the p53 signaling network by using {P} systems},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={449--454}
}

@inproceedings{Qi:PreWMC2003:P_systems_and_Petri_:03,
	author={Zhengwei Qi and Jinyuan You},
	title={{P} systems and {Petri} nets},
	booktitle={Preproceedings of the Workshop on Membrane Computing},
	year={2003},
	month={July 17-22},
	address={Tarragona},
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	pages={387--403.}
}

@inproceedings{Zhengwei:WMC2003:P_Systems_and_Petri_:03,
	author={Zhengwei Qi and Jinyuan You and Hongyan Mao},
	title={{P} systems and {Petri} Nets},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July, 17-22, 2003, Revised Papers},
	year={2003},
	month={July},
	publisher={Springer},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	pages={286--303},
	abstract={We propose an intriguing relationship between P systems and Petri nets.
		For a basic model of P systems, this paper presents a new formalization
		based on place/transition nets, which can adopt one transition to implement
		the structural operational semantics of one evolving rule in P systems
		and utilize incidence matrix to analyze the computation of one macro-step.
		We also define the behavioral properties in P systems such as terminating,
		liveness, and boundedness based on this formalization. For a general class
		of P systems, we briefly describe a high-level framework called membrane
		Petri nets (MP-nets). MP-nets extend ordinary colored Petri nets (CPN)
		through introducing the dynamic features such as dissolve, divide, and
		move inspired by P systems. Therefore, MP-nets can be a graphical as well
		as an algebraic modelling tool for both generic P systems and dynamic CPN.},
	series={Lecture Notes in Computer Science},
	volume={2933}
}

@inproceedings{Leporati:WUMC:Quantum_energy_based:2004,
	author={A. Leporati and D. Pescini and C. Zandron},
	title={Quantum Energy-based {P} systems},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Obtulowicz:WUMC:Fuzzy_P_Systems:2004,
	author={A. Obtulowicz},
	title={Fuzzy {P} systems and fuzzy rule-based decisionmaking systems},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Syropoulos:Distributed_Computing:WMC5:2004,
	author={A. Syropoulos},
	title={On {P} systems and Distributed Computing},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={405--413}
}

@inproceedings{Syropoulos:WUMC:Fuzzifying:2004,
	author={A. Syropoulos},
	title={Fuzzifying {P} systems},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Syropoulos:Computing_Recursive_Functions:WMC5:2004,
	author={A. Syropoulos and Stratos Doumanis and Kostantinos T. Sotiriades},
	title={Computing Recursive Functions with {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={414--421}
}

@inproceedings{Obtulowicz:General_Multi-fuzzy_Sets:WMC5:2004,
	author={Adam Obtulowicz},
	title={General Multi-fuzzy Sets and Fuzzy Membrane Systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={316--326}
}

@inproceedings{Leporati:Conservative_Computations:WMC5:2004,
	author={Alberto Leporati and Claudio Zandron and Giancarlo Mauri},
	title={Conservative Computations in Energy-based {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={268--283}
}

@inproceedings{Lepora:BWMC2004:Simulating_the_Fredk:04,
	author={Alberto Leporati and Claudio Zandron and Giancarlo Mauri},
	title={Simulating the {Fredkin} Gate with Energy--Based {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={292--308}
}

@inproceedings{Cordon:Non-discrete_P_Systems:WMC5:2004,
	author={Andr{\'e}s Cord{\'o}n-Franco and Fernando Sancho-Caparrini},
	title={Non-discrete {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={205--207}
}

@inproceedings{Cordon:BWMC2004:Looking_for_P_Truth:04,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Looking for {P} Truth},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={134--138}
}

@inproceedings{Cordon:Exploring_Computation_Trees:WMC5:2004,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Exploring Computation Trees Associated with {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={196--204}
}

@inproceedings{Cordon:BWMC2004:Weak_Metrics_on_Conf:04,
	author={Andr{\'e}s Cord{\'o}n-Franco and Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez
		and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Weak Metrics on Configurations of a {P} system},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={139--151}
}

@inproceedings{Binder:Catalytic:CIAA:2004,
	author={Aneta Binder and Rudolf Freund and Georg Lojka and Marion Oswald},
	title={Implementation of Catalytic {P} systems},
	booktitle={Ninth International Conference on Implementation and Application of Automata
		Queen's University, Kingston, Ontario, Canada, July 22-24, 2004},
	year={2004},
	month={July 22-24},
	address={Ontario, Canada},
	pages={24--33}
}

@inproceedings{Syropoulos:WMC2003:Distributed_Simulation:2004,
	author={Apostolos Syropoulos and Eleftherios G. Mamatas and Peter C. Allilomes and
		Konstantinos T. Sotiriades},
	title={A Distributed Simulation of Transition {P} systems},
	booktitle={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July 17-22, 2003, Revised Papers},
	year={2004},
	publisher={Springer-Verlag Heidelberg},
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un, Grzegorz
		Rozenberg and Arto Salomaa},
	pages={357--368},
	abstract={P systems is a new model of computation, inspired by natural processes,
		that has a distributive nature. By exploring this distributive nature of
		P systems, we have built a purely distributive simulation of P systems.
		The simulation, whose implementation is described here, was programmed
		in the Java programming language and makes heavy use of its Remote Method
		Invocation protocol. The class of P systems that the simulator can accept
		is a subset of the family of systems, which have the computational power
		of Turing machines. The paper concludes with some remarks concerning the
		usefulness of the simulation. In addition, there is a brief discussion
		of some ideas that can be used in the formulation of a foundation of distributive
		computing.},
	series={Lecture Notes In Computer Science},
	volume={2933}
}

@inproceedings{Alhazo:BWMC2004:On_the_Power_of_Dete:04,
	author={Artiom Alhazov},
	title={On the Power of Deterministic {EC P Systems}},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={11--15}
}

@inproceedings{Alhazo:BWMC2004:A_Note_on_P_Systems_:04,
	author={Artiom Alhazov},
	title={A Note on {P} systems with Activators},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={16--19}
}

@inproceedings{Alhazov:Parallel_Multiset-Rewriting:WMC5:2004,
	author={Artiom Alhazov and Dragos Sburlan},
	title={(Ultimately Confluent) Parallel Multiset-Rewriting Systems with Permitting
		Context},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={95--103}
}

@inproceedings{Alhazov:On_the_Efficiency_of:WMC5:2004,
	author={Artiom Alhazov and Rudolf Freund},
	title={On the Efficiency of {P} systems with Active membranes and Two Polarizations},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={81--94}
}

@inproceedings{Alhazo:BWMC2004:P_Systems_with_Activ:04,
	author={Artiom Alhazov and Rudolf Freund and Gheorghe P{\u a}un},
	title={{P} systems with Active Membranes and Two Polarizations},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={20--36}
}

@inproceedings{Alhazo:BWMC2004:Membrane_Operations_:04,
	author={Artiom Alhazov and Tseren-Onolt Ishdorj},
	title={Membrane Operations in {P} systems with Active Membranes},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={37--44}
}

@inproceedings{Profir:Modelling_Molecular_Genetic:WMC5:2004,
	author={Aurelia Profir and Elena Boian and N. Barbacari and E. Gutuleac and Cleo
		Zelinschi},
	title={Modelling Molecular Genetic trigger by Means of {P} Transducer},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={360--362}
}

@inproceedings{Fu:Encoding_P_Systems:WMC5:2004,
	author={Cheng Fu and Zhengwei Qi and Jinyuan You},
	title={Encoding {P} systems in Non-interleaving $\pi$-{C}alculus},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={233--244}
}

@inproceedings{Teuscher:Chemical_Blending:UPP04:2004,
	author={Christof Teuscher},
	title={Chemical blending with particles, cells and artificial chemistries},
	booktitle={Pre-Proc. Unconventional Programming Paradigms, UPP04, Le Mont Saint-Michel},
	year={2004},
	month={September},
	pages={29--37}
}

@inproceedings{Genova:MAA:2004,
	author={D. Genova},
	title={Models in membrane computing},
	booktitle={Joint Annual Meeting MAA Florida Section and FTYCMA, Univ. of Central Florida},
	year={2004},
	month={February}
}

@inproceedings{Besozz:BWMC2004:Size_and_Power_of_Ex:04,
	author={Daniela Besozzi and Erzs{\'e}bet Csuhaj-Varj{\'u} and Giancarlo Mauri and Claudio
		Zandron},
	title={Size and Power of Extended Gemmating P Pystems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={92--101}
}

@inproceedings{Besozzi:A_P_Systems_Description_of:WMC5:2004,
	author={Daniela Besozzi and Gabriel Ciobanu},
	title={A {P} systems Description of the Sodium-Potassium Pump},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={154--160}
}

@inproceedings{Sburlan:Cells_to_software:MMELSP:2004,
	author={Dragos Sburlan},
	title={From cells to software architecture. {A} {P} system outlook of computational
		design},
	booktitle={Third Workshop on Mathematical Modelling of Environmental and Life Sciences
		Problems},
	year={2004},
	address={Constancta}
}

@inproceedings{Sburlan:Clock-free:WMC5:2004,
	author={Dragos Sburlan},
	title={Clock-free {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={372--383}
}

@inproceedings{Csuhaj:P_automata:_Models_Results:WMC5:2004,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u}},
	title={{P} automata: Models, Results, and Research Topics},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={1--11}
}

@inproceedings{Csuhaj:Reducing_the_Size_of_Extended:WMC5:2004,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Gy{\"o}rgy Vaszil},
	title={Reducing the Size of Extended Gemmating {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={208--220}
}

@inproceedings{Sancho:BWMC2004:A_Note_on_Complexity:04,
	author={F. Sancho-Caparrini},
	title={A Note on Complexity Measures for Probabilistic {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={443--448}
}

@inproceedings{Fontan:BWMC2004:Maximum_Search_Using:04,
	author={Federico Fontana and Giuditta Franco},
	title={Maximum Search Using {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={152--163}
}

@inproceedings{Arroyo:Representing_Multisets:WMC5:2004,
	author={Fernando Arroyo and Carmen Luengo and Juan Castellanos and L.F. de Mingo},
	title={Representing Multisets and Evolution Rules in Membrane Processors},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={126--137}
}

@inproceedings{Bernardini:Computing_at_Population:WMC5:2004,
	author={Francesco Bernardini and Marian Gheorghe},
	title={Computing at Population Level in {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={151--153}
}

@inproceedings{Bernar:BWMC2004:Cell_Communication_i:04,
	author={Francesco Bernardini and Marian Gheorghe},
	title={Cell Communication in Tissue {P} systems and Cell Division in Population
		{P Systems}},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={74--91}
}

@inproceedings{BelEnguix1:LNAI3192:2004,
	author={G. Bel Enguix and M.D. Jimenez-Lopez},
	title={Computing speech acts, Artificial Intelligence.},
	booktitle={Methodology, Systems and Applications},
	year={2004},
	publisher={Springer},
	editor={Ch. Bussler and D. Fensel},
	pages={236--245},
	series={LNAI 3192}
}

@inproceedings{Cioban:BWMC2004:Pumps_Systems_of_Mem:04,
	author={Gabriel Ciobanu},
	title={Pumps Systems of Membranes},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={130--133}
}

@inproceedings{Ciobanu:meta_programming:UPP04:2004,
	author={Gabriel Ciobanu},
	title={Cellular meta-programming},
	booktitle={Pre-Proc. Unconventional Programming Paradigms, UPP04, Le Mont Saint-Michel},
	year={2004},
	month={September},
	pages={55--63}
}

@inproceedings{Bel:Analyzing_P_Systems_Structure:WMC5:2004,
	author={Gemma Bel-Enguix},
	title={Analyzing {P} systems Structure: Working, Predictions, and some Linguistic
		Suggestions},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={138--150}
}

@inproceedings{Bel:Explaining_language:MTA:2004,
	author={Gemma Bel-Enguix and Mar{\'i}a-Dolores Jim{\'e}nez-L{\'o}pez},
	title={Explaining language change with membranes},
	booktitle={Pre-Proceedings of Workshop on Grammar Systems, Computer and Automation
		Research Institute (SZTAKI) of the Hungarian Academy of Sciences (MTA)},
	year={2004},
	month={July 5-9},
	address={Budapest},
	pages={31--46}
}

@inproceedings{Paun:WUMC:Introduction_MC:2004,
	author={Gheorghe P{\u a}un},
	title={Introduction to Membrane Computing},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Paun:Grammar_Sys_vs_MC:MTA:2004,
	author={Gheorghe P{\u a}un},
	title={Grammar systems vs. membrane computing: A preliminary approach},
	booktitle={Pre-Proceedings of Workshop on Grammar Systems, Computer and Automation
		Research Institute (SZTAKI) of the Hungarian Academy of Sciences (MTA).},
	year={2004},
	month={July 5-9},
	address={Budapest},
	pages={225--245}
}

@inproceedings{Paun:MC_Introduction:UPP04:2004,
	author={Gheorghe P{\u a}un},
	title={Membrane computing. {An} introduction},
	booktitle={Pre-Proc. Unconventional Programming Paradigms, UPP04, Le Mont Saint-Michel},
	year={2004},
	month={September},
	pages={39--48}
}

@inproceedings{Paun:DNA10:Membrane_Computing:2004,
	author={Gheorghe P{\u a}un},
	title={Membrane computing: Power and efficiency (A quick overview)},
	booktitle={THE TENTH INTERNATIONAL MEETING ON DNA COMPUTING (DNA 10), Universita' di
		Milano-Bicocca, Milan, Italy},
	year={2004},
	month={June 7-10},
	address={Milan, Italy}
}

@inproceedings{Paun:ICCC2004:Learning_new_computing:2004,
	author={Gheorghe P{\u a}un},
	title={Learning new computing models from biology: Membrane computing},
	booktitle={International Conference on Computers and Communications-ICCC 2004, Baile
		Felix Spa, Oradea, ROMANIA},
	year={2004},
	month={May 27-29},
	address={Oradea, ROMANIA}
}

@inproceedings{Paun:BWMC2004:Further_open_problem:04,
	author={Gheorghe P{\u a}un},
	title={Further open problems in {Membrane} {Computing}, {Sevilla}, {Spain}, February
		2--7 2004},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={354--365}
}

@inproceedings{Paun:WoLLIC2004:Membrane_systems:2004,
	author={Gheorghe P{\u a}un},
	title={Membrane systems: From cells to computers},
	booktitle={WoLLIC'2004 11th Workshop on Logic, Language, Information and Computation,
		July 19th to 22nd, 2004, Paris, France},
	year={2004},
	month={July 19th to 22nd},
	address={Paris, France}
}

@inproceedings{Paun:BWMC2004:P_Systems_with_Table:04,
	author={Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={{P} systems with Tables of Rules},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={366--379}
}

@inproceedings{Paun:BWMC2004:Tissue_P_Systems_wit:04,
	author={Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Tissue {P} systems with Cell Division},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={380--386}
}

@inproceedings{Franco:BWMC2004:Membrane_Kauffman_Ne:04,
	author={Giuditta Franco},
	title={Membrane {Kauffman} Networks},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={164--167}
}

@inproceedings{Rozenberg:Selectivity_in_Molecular:WMC5:2004,
	author={Grzegorz Rozenberg},
	title={Selectivity in Molecular Computing},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={64--64}
}

@inproceedings{Vaszil:On_the_Size_of_P_Systems:WMC5:2004,
	author={Gy{\"o}rgy Vaszil},
	title={On the Size of {P} systems with Minimal Symport/Antiport},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={422--431}
}

@inproceedings{Arde:BWMC2004:New_Proposals_for_th:04,
	author={Ioan I. Ardelean and Daniela Besozzi},
	title={New Proposals for the Formalization of Membrane Proteins},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={53--59}
}

@inproceedings{Ardelean:Aerobic_Respiration_is_a:WMC5:2004,
	author={Ioan I. Ardelean and Daniela Besozzi and Corrado Manara},
	title={Aerobic Respiration is a Bio-logic Circuit Containing Molecular Logic Gates},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={119--125}
}

@inproceedings{Arde:BWMC2004:Computing_Using_Sign:04,
	author={Ioan I. Ardelean and Matteo Cavaliere and Dragos Sburlan},
	title={Computing Using Signals: From Cells to {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={60--73}
}

@inproceedings{Stamatopoulou:Modelling_of_Dynamic:WMC5:2004,
	author={Ioanna Stamatopoulou and Marian Gheorghe and Petros Kefalas},
	title={Modelling of Dynamic Configuration of Biology-Inspired Multi-agent Systems
		with Communicating {X}-machines and Population {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={392--404}
}

@inproceedings{Nepo:BWMC2004:A_Java_Simulator_for:04,
	author={Isabel A. Nepomuceno-Chamorro},
	title={A {Java} Simulator for Basic Transition {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={309--315}
}

@inproceedings{Bartosik:Paun_systems:CTMDT:2004,
	author={J. Bartosik},
	title={Paun's systems in modeling of human resource management},
	booktitle={Proceedings of the Second Conference on Tools and Methods of Data Transformation},
	year={2004},
	organization={WSU Kielce}
}

@inproceedings{Bartosik:Heaps_of_pieces:CTMDT:2004,
	author={J. Bartosik},
	title={Heaps of pieces and Paun's systems},
	booktitle={Proceedings of the Second Conference on Tools and Methods of Data Transformation},
	year={2004},
	organization={WSU Kielce}
}

@inproceedings{Cassanovas:WUMC:Counting_contents:2004,
	author={J. Casasnovas and F. Rossello},
	title={Counting the contents of fuzzy membranes... and related problem},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Cassanovas:WUMC:Fuzzi_app_copies:2004,
	author={J. Casasnovas and M. Moya and J. Miro and F. Rossello},
	title={A fuzzy approach to membrane computing with approximate copies},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Inouye:Fibonacci:IMCSCE:2004,
	author={J. Inouye},
	title={Fibonacci sequence generation using membrane computing},
	booktitle={The 2004 Intern. Multiconference in Computer Science and Computer Engineering,
		Las Vegas},
	year={2004},
	pages={384--389}
}

@inproceedings{Inouye:Quantumi:IMCSCE:2004,
	author={J. Inouye},
	title={Quantum simulation using membrane computing},
	booktitle={The 2004 Intern. Multiconference in Computer Science and Computer Engineering,
		Las Vegas},
	year={2004},
	pages={403--409}
}

@inproceedings{Wiedermann:Coupling_Computational:WMC5:2004,
	author={Jiri Wiedermann},
	title={Coupling Computational and Non-computational processes: Minimal Artificial
		Life},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={432--445}
}

@inproceedings{Semp:BWMC2004:Covering_Rules_in_P_:04,
	author={Jos{\'e} M. Sempere},
	title={Covering Rules in {P} systems: Some Preliminary Ideas},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={449--456}
}

@inproceedings{Sempere:Covering_Reductions:WMC5:2004,
	author={Jos{\'e} M. Sempere},
	title={Covering Reductions and Degrees in {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={384--391}
}

@inproceedings{Kelemen:P_Colonies:ALIFE9:2004,
	author={Jozef Kelemen and Alica Kelemenova and Gheorghe P{\u a}un},
	title={{P} colonies},
	booktitle={Workshop on Artificial Chemistry, ALIFE9},
	year={2004},
	month={September 12-15},
	address={Boston, Massachusetts, USA}
}

@inproceedings{Ueda:LMNtal:WMC5:2004,
	author={K. Ueda and N. Nato},
	title={{LMNtal}: A Language Model with Links and Membranes},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={65--80}
}

@inproceedings{Bianco:WUMC:Metabolic_algorithms:2004,
	author={L. Bianco and Vincenzo Manca},
	title={Metabolic algorithms and signal transduction dynamical networks},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Pan:BWMC2004:Further_Remarks_on_P:04,
	author={Linqiang Pan and Artiom Alhazov and Tseren-Onolt Ishdorj},
	title={Further Remarks on {P} systems with Active Membranes, Separation, Merging,
		and Release Rules},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={316--324}
}

@inproceedings{Pan:BWMC2004:Solving_Multidimensi:04,
	author={Linqiang Pan and Carlos Mart{\'i}n-Vide},
	title={Solving Multidimensional 0-1 {Knapsack} Problem by {P} systems with Input
		and Active Membranes},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={342--353}
}

@inproceedings{Pan:BWMC2004:P_Systems_with_Activ:04,
	author={Linqiang Pan and Tseren-Onolt Ishdorj},
	title={{P} systems with Active Membranes and Separation Rules},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={325--341}
}

@inproceedings{Ledesm:BWMC2004:A_Tissue_P_System_an:04,
	author={Lucas Ledesma and Daniel Manrique and Alfonso Rodr{\'i}guez-Pat{\'o}n and Andr{\'e}s
		Silva},
	title={A Tissue {P} system and a {DNA} Microfluidic Device for Solving the Shortest
		Common Superstring Problem},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={281--291}
}

@inproceedings{Cienciala:P_Automata_Priorities_Working:WMC5:2004,
	author={Ludek Cienciala},
	title={{P} Automata with Priorities Working in Sequential and Maximally Parallel
		Mode},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={186--195}
}

@inproceedings{Gheorghe:FISCC:2004,
	author={M. Gheorghe and N. Krasnogor and Gh. Paun and G. Rozenberg},
	title={Membrane computing model for tiles self-assembly},
	booktitle={First Intern. Symp. on Cellular Computing, Warwick},
	year={2004},
	month={December}
}

@inproceedings{Gheorghe:Modelling_Language:UPP04:2004,
	author={Marian Gheorghe},
	title={{P} systems: A modelling language},
	booktitle={Pre-Proc. Unconventional Programming Paradigms, UPP04, Le Mont Saint-Michel},
	year={2004},
	month={September},
	pages={23--27}
}

@inproceedings{PerezJ:WUMC:Comput_complexity:2004,
	author={Mario J. P{\'e}rez-Jim{\'e}nez},
	title={An Approach to Computational Complexity in Membrane Computing},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Perez-Jimenez:Complexity_Clsses:WMC5:2004,
	author={Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Complexity Clsses in Membrane Computing},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={63--63}
}

@inproceedings{Pere:BWMC2004:A_CLIPS_Simulator_fo:04,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Francisco-Jos{\'e} Romero-Campero},
	title={A {CLIPS} Simulator for Recognizer {P} systems with Active Membranes},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={387--413}
}

@inproceedings{Perez-Jimenez:Trading_Polarizations:WMC5:2004,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Francisco-Jos{\'e} Romero-Campero},
	title={Trading Polarizations for Bi-stable Catalysts in {P} systems with Active
		Membranes},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={327--342}
}

@inproceedings{Pere:BWMC2004:Solving_the_BINPACKI:04,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Francisco-Jos{\'e} Romero-Campero},
	title={Solving the {BINPACKING} Problem by Recognizer {P} systems with Active Membranes},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={414--430}
}

@inproceedings{Cavaliere:WUMC:Handling_Imprecision:2004,
	author={Matteo Cavaliere},
	title={Modelling Biological Processes in {P} systems: Handling Imprecision and
		Constructing New Models},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Cavaliere:Towards_Asynchronous_P:WMC5:2004,
	author={Matteo Cavaliere},
	title={Towards Asynchronous {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={161--173}
}

@inproceedings{Cavali:BWMC2004:P_Systems_with_Sympo:04,
	author={Matteo Cavaliere and Daniela Genova},
	title={{P} systems with Symport/Antiport of Rules},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={102--116}
}

@inproceedings{Cavaliere:Inhibiting/de-inhibiting_Rules:WMC5:2004,
	author={Matteo Cavaliere and Mihai Ionescu and Tseren-Onolt Ishdorj},
	title={Inhibiting/de-inhibiting Rules in {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={174--183}
}

@inproceedings{Margenstern:About_P_Systems_and_Lambda:WMC5:2004,
	author={Maurice Margenstern with L. Colson and Natasha Jonoska and Gheorghe P{\u a}un},
	title={About {P} systems and $\lambda$-{C}alculus},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={44--62}
}

@inproceedings{Margenstern:About_P_Systems_with_Minimal:WMC5:2004,
	author={Maurice Margenstern and Vladimir Rogozhin and Yurii Rogozhin and Sergey
		Verlan},
	title={About {P} systems with Minimal Symport/Antiport Rules and Four Membranes},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={283--294}
}

@inproceedings{Guti:BWMC2004:An_Efficient_Cellula:04,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={An Efficient Cellular Solution for the {Partition} {Problem}},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={237--246}
}

@inproceedings{Guti:BWMC2004:Towards_a_Programmin:04,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Towards a Programming Language in Cellular Computing},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={247--257}
}

@inproceedings{Gutierrez:On_Descriptive_Complexity:WMC5:2004,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={On Descriptive Complexity of {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={245--255}
}

@inproceedings{Guti:BWMC2004:Deductive_Databases_:04,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Vladimir Rogozhin},
	title={Deductive Databases and {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={258--263}
}

@inproceedings{Ionesc:BWMC2004:On_P_Systems_with_Pr:04,
	author={Mihai Ionescu and Dragos Sburlan},
	title={On {P} systems with Promoters/Inhibitors},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={264--280}
}

@inproceedings{Moya:WUMC:Plasma_membrane:2004,
	author={O. Moya-Mesa},
	title={Plasma membrane, compartmentation, transport, and imprecisions},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Andrei:Rewriting_P_Systems_in:WMC5:2004,
	author={Oana Andrei and Gabriel Ciobanu and Dorel Lucanu},
	title={Rewriting {P} systems in Maude},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={104--118}
}

@inproceedings{Michel:Analysis_of_the_Needham:WMC5:2004,
	author={Olivier Michel and Florent Jacquemard},
	title={Analysis of the {Needham}-{Schroeder} public-key protocol with {MGS}},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={295--315}
}

@inproceedings{Ibarra:Recent_Results:UPP04:2004,
	author={Oscar H. Ibarra},
	title={{P} systems: Some recent results and research problems},
	booktitle={Pre-Proc. Unconventional Programming Paradigms, UPP04, Le Mont Saint-Michel},
	year={2004},
	month={September},
	pages={47--54}
}

@inproceedings{Frisco:BWMC2004:About_P_Systems_with:04,
	author={Pierluigi Frisco},
	title={About {P} systems with Symport/Antiport},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={224--236}
}

@inproceedings{Ceterchi:Sim_Parallel_Architectures:WMC5:2004,
	author={Rodica Ceterchi and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Simulating Parallel Architectures with {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={184--185}
}

@inproceedings{Ceterchi:ICCC2004:A_perfect_shuffle_algorithm:04,
	author={Rodica Ceterchi and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={A perfect shuffle algorithm for reduction processes and its simulation with
		{P} systems},
	booktitle={International Conference on Computers and Communications-ICCC 2004, Baile
		Felix Spa, Oradea, ROMANIA},
	year={2004},
	month={May 27-29},
	address={Oradea, ROMANIA}
}

@inproceedings{Ceterc:BWMC2004:Simulating_Shuffle-E:04,
	author={Rodica Ceterchi and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Simulating Shuffle-Exchange Networks with {P} systems},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={117--129}
}

@inproceedings{Freund:Asynchronous_P_Systems:WMC5:2004,
	author={Rudolf Freund},
	title={Asynchronous {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={12--28}
}

@inproceedings{Freund:P_sequentiellen,
	author={Rudolf Freund},
	title={P systeme im sequentiellen Modus},
	booktitle={Workshop Formale Methoden der Linguistik, and 14 Theorietag Automaten und
		Formale Sprachen},
	year={2004},
	address={Potsdam},
	pages={57--61}
}

@inproceedings{Freund:BWMC2004:Sequential_P_Systems:04,
	author={Rudolf Freund and Alberto Leporati and Marion Oswald and Claudio Zandron},
	title={Sequential {P} systems with Unit Rules and Energy Assigned to Membranes},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={168--182}
}

@inproceedings{Freund:BWMC2004:P_Systems_with_Activ:04,
	author={Rudolf Freund and Andrei P{\u a}un},
	title={{P} systems with Active Membranes and without Polarizations},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={193--205}
}

@inproceedings{Freund:BWMC2004:Tissue-like_P_System:04,
	author={Rudolf Freund and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Tissue-like {P} systems with Channel-States},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={206--223}
}

@inproceedings{Freund:BWMC2004:P_Systems_with_Antip:04,
	author={Rudolf Freund and Marion Oswald},
	title={{P} systems with Antiport Rules for Evolution Rules},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={183--192}
}

@inproceedings{Freund:Modelling_GS:MTA:2004,
	author={Rudolf Freund and Marion Oswald},
	title={Modelling grammar systems by tissue {P} systems},
	booktitle={Pre-Proceedings of Workshop on Grammar Systems, Computer and Automation
		Research Institute (SZTAKI) of the Hungarian Academy of Sciences (MTA)},
	year={2004},
	month={July 5-9},
	address={Budapest},
	pages={162--179}
}

@inproceedings{Freund:P_Systems_Generating_Trees:WMC5:2004,
	author={Rudolf Freund and Marion Oswald and Andrei P{\u a}un},
	title={{P} systems Generating Trees},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={221--232}
}

@inproceedings{Aguzzoli:WUMC:t_norm_approach:2004,
	author={S. Aguzzoli and D. Besozzi and B. Gerla and C. Manara},
	title={{P} systems with vague boundaries: the t-norm approach},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Aguzzoli:WUMC:tansmembrane_proteins:2004,
	author={S. Aguzzoli and I.I. Ardelean and D. Besozzi and B. Gerla and C. Manara},
	title={{P} systems under uncertainty: the case of transmembrane proteins},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Krishna:Universality_with_RBC-like:WMC5:2004,
	author={Shankara-Narayanan Krishna},
	title={Universality with {RBC}-like objects},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={256--267}
}

@inproceedings{Nishida:WUMC:Approximate_algorithm:2004,
	author={Taishin Yasunobu Nishida},
	title={An approximate algorithm for {NP}-complete optimization problems exploiting
		{P} systems},
	booktitle={First brainstorming Workshop on Uncertainty in Membrane Computing, Palma
		de Mallorca, Spain, November 2004},
	year={2004}
}

@inproceedings{Nishida:8_SCI_2004:New_Alg_NP_Complete_Opt:2004,
	author={Taishin Yasunobu Nishida},
	title={An application of {P} systems: {A} new algorithm for {NP}-complete optimization
		problems},
	booktitle={Proceedings of the 8th World Multi-Conference on Systems, Cybernetics and
		Informatics, vol. V, 2004},
	year={2004},
	editor={N. Callaos, et. al.},
	pages={109--112}
}

@inproceedings{Prakash:Simulating_Boolean:WMC5:2004,
	author={V.J. Prakash and Kamala Krithivasan},
	title={Simulating Boolean Circuits with Tissue {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={343--359}
}

@inproceedings{Manca:On_the_Dynamics_of_P:WMC5:2004,
	author={Vincenzo Manca},
	title={On the Dynamics of {P} systems},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={29--43}
}

@inproceedings{Rogozhin:ICCC2004:Simulation_of_mobile:2004,
	author={Vladimir Rogozhin and Elena Boian},
	title={Simulation of mobile ambients by tissue {P} systems with a dynamic network
		of membranes},
	booktitle={International Conference on Computers and Communications-ICCC 2004, Baile
		Felix Spa, Oradea, ROMANIA},
	year={2004},
	month={May 27-29},
	address={Oradea, ROMANIA}
}

@inproceedings{Rogozh:BWMC2004:Simulation_of_Mobile:04,
	author={Vladimir Rogozhin and Elena Boian},
	title={Simulation of Mobile Ambients by {P} systems. {P}art 2},
	booktitle={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, February
		2-7 2004},
	year={2004},
	month={February 2-7},
	address={Sevilla, Spain},
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez and
		Fernando Sancho-Caparrini},
	pages={431--442}
}

@inproceedings{Kowczynski:Economic_Systems:CTMDT:2004,
	author={W. Kowczynski},
	title={On a model of economic systems},
	booktitle={Proceedings of the Second Conference on Tools and Methods of Data Transformation},
	year={2004},
	organization={WSU Kielce}
}

@inproceedings{Kowczynski:Reconstruction_Problem:CTMDT:2004,
	author={Waldemar Korczynski and G. Wawrzola and S. Wawrzola},
	title={On a reconstruction problem for membrane systems},
	booktitle={Proceedings of the Second Conference on Tools and Methods of Data Transformation},
	year={2004},
	organization={WSU Kielce}
}

@inproceedings{Qi:SCC:2004,
	author={Z. Qi and R. Rao and G. Xue and J. You},
	title={A new formal model based on P systems for mobile transactions},
	booktitle={Proc. IEEE Intern. Conf. on Services Computing, SCC2004},
	year={2004},
	pages={16--22}
}

@inproceedings{Dang:Sequential_parallel_models:DCFS:2004,
	author={Zhe Dang and Oscar H. Ibarra},
	title={On {P} systems operating in sequential and limited parallel modes},
	booktitle={Workshop on Descriptional Complexity of Formal Systems},
	year={2004},
	address={London-Ontario}
}

@inproceedings{Qi:Specification_and_Execution:WMC5:2004,
	author={Zhengwei Qi and Cheng Fu and Dongyu Shi and Jinyuan You},
	title={Specification and Execution of {P} systems with Symport/Antiport Rules Using
		Rewriting logic},
	booktitle={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5), Milano,
		Italy, June 2004},
	year={2004},
	month={June},
	address={Milano, Italy},
	pages={363--371}
}

@inproceedings{Qi:Membrane_Calculus:GCC:2004,
	author={Zhengwei Qi and Cheng Fu and Dongyu Shi and Jinyuan You and M. Li},
	title={Membrane calculus. {A} formal method for grid transactions},
	booktitle={Proceedings of the 3rd International Conference on Grid and Cooperative
		Computing, GCC 2004},
	year={2004},
	address={Wuhan, China}
}

@inproceedings{Alhazov:Number:WMC6:2005,
	author={A. Alhazov},
	title={Number of Proton/Bi-stable Catalysts and Membrane in P Systems. Time Freeness},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={102-122}
}

@inproceedings{Alhazov:1stWTAPSys:2005,
	author={A. Alhazov and R. Freund and A. Riscos-Nunez},
	title={One and Two Polarizations, Membrane Creation and Objects Complexity in P
		Systems},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={9-18}
}

@inproceedings{Alhazov:Symbol:WMC6:2005,
	author={A. Alhazov and R. Freund and M. Oswald},
	title={Symbol/Membrane Complexity of P Systems with Symport/Antiport Rules},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={123-146}
}

@inproceedings{Gutierrez:1stWTAPSys:2005,
  author       = {M. A. Guti{\'e}rrez-Naranjo and M. J. Perez-Jimenez and A. Riscos-Nunez and F.
                  J. Romero-Campero},
  title        = {Characterizing Tractability with Membrane Creation},
  booktitle    = {in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
                  and Application of P Systems, Timisoara, Romania, September 26-27},
  year         = {2005},
  pages        = {61-68},
}

@inproceedings{Leporati:Quantum:WMC6:2005,
	author={A. Leporati and G. Mauri and C. Zandron},
	title={Quantum Sequential P Systems with Unit Rules and Energy Assigned to Membranes},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={465-484}
}

@inproceedings{Obtulowicz:Relational:WMC6:2005,
	author={A. Obtulowicz},
	title={Relational Membrane Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={505-509}
}

@inproceedings{Profir:1stWTAPSys:2005,
	author={A. Profir and E. Gutuleac and E. Boian},
	title={Simulation of Continuous-time P Systems using Descriptive Rewriting Timed
		Petri Nets},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={91-94}
}

@inproceedings{Obtulowicz:Gandy's_principles:EFS_EWCC:2005,
	author={Adam Obtulowicz},
	title={Gandy's principles for mechanisms and membrane computing},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={267--276}
}

@inproceedings{Obtulowicz:Gandy's_principle_for_MC:3BWMC:2005,
	author={Adam Obtulowicz},
	title={Gandy's principle for mechanisms and membrane computing},
	booktitle={Third Brainstorming Week on Membrane Computing, Sevilla, 2005},
	year={2005},
	address={Sevilla}
}

@inproceedings{Leporati:solve_3-SAT:EFS_EWCC:2005,
	author={Alberto Leporati and Claudio Zandron},
	title={A family of {P} systems which solve 3-{SAT}},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={247--256}
}

@inproceedings{Ortega:Christiansen_grammar:3BWMC:2005,
	author={Alfonso Ortega de la Puente and Rafael N{\'u}{\~n}ez-Herv{\'a}s and Marina de la Cruz-Echeandia
		and Manuel Alfonseca},
	title={Christiansen grammar for some {P} systems},
	booktitle={Third Brainstorming Week on Membrane Computing, Sevilla, 2005},
	year={2005},
	address={Sevilla}
}

@inproceedings{Alhazov:Maximally_parallel,
	author={Artiom Alhazov},
	title={Maximally parallel multiset-rewriting systems: Browsing the configurations},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={1--10}
}

@inproceedings{Alhazov:Solving_SAT:EFS_EWCC:2005,
	author={Artiom Alhazov},
	title={Solving {SAT} by symport/antiport {P} systems with membrane division},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={1--6}
}

@inproceedings{Alhazov:Evolution-communication:3BWMC:2005,
	author={Artiom Alhazov and Matteo Cavaliere},
	title={Evolution-communication {P} systems: Time-freeness},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={11--18}
}

@inproceedings{Alhazov:P_systems_with_one_membrane:3BWMC:2005,
	author={Artiom Alhazov and Rudolf Freund},
	title={P systems with one membrane and symport/antiport rules of five symbols are
		computationally complete},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={19--28}
}

@inproceedings{Alhazov:Tissue_P_systems:EFS_EWCC:2005,
	author={Artiom Alhazov and Rudolf Freund and Marion Oswald},
	title={Tissue {P} systems with antiport rules and small numbers of symbols and
		cells},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={7--22}
}

@inproceedings{Alhazov:Some_optimal_results:EFS_EWCC:2005,
	author={Artiom Alhazov and Rudolf Freund and Yurii Rogozhin},
	title={Some optimal results on symport/antiport {P} systems with minimal cooperation},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={23--36}
}

@inproceedings{Alhazov:Sevilla_carpets_of:EFS_EWCC:2005,
	author={Artiom Alhazov and Sergey Verlan},
	title={Sevilla carpets of deterministic non-cooperative {P} systems},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={53--60}
}

@inproceedings{Alhazov:Minimal_cooperation_in:3BWMC:2005,
	author={Artiom Alhazov and Yurii Rogozhin},
	title={Minimal cooperation in symport/antiport {P} systems with one membrane},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={29--34}
}

@inproceedings{Alhazov:Symport/antiport_tissue:EFS_EWCC:2005,
	author={Artiom Alhazov and Yurii Rogozhin and Sergey Verlan},
	title={Symport/antiport tissue {P} systems with minimal cooperation},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={37--52}
}

@inproceedings{Csuhaj:Editing_configurations:3BWMC:2005,
	author={C. Csuhaj-Varj{\'u} and Antonio Di Nola and Gheorghe P{\u a}un and Mario Jes{\'u}s
		P{\'e}rez-Jim{\'e}nez and Gy{\"o}rgy Vaszil},
	title={Editing configurations of {P} systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={131--154}
}

@inproceedings{Graciani:Numerical_decision_problems:CiE2005:2005,
	author={C. Graciani and Agust{\'i}n Riscos-Nunez},
	title={Looking for simple common schemes to design recognizer P systems with active
		membranes that solve numerical decision problems},
	booktitle={CiE2005: New Computational Paradigms},
	year={2005},
	address={Amsterdam}
}

@inproceedings{Li:ICALP05:2005,
	author={C. Li and Z. Dang and O. Ibarra and H.C. Yen},
	title={Signaling P Systems and Verification Problems},
	booktitle={ICALP'05},
	year={2005},
	month={, July 11-15}
}

@inproceedings{Li:LNCS3586:2005,
	author={C. Li and Z. Dang and O.H. Ibarra and H.-C. Yen},
	title={Signaling P Systems and Verification Problems},
	booktitle={Proceedings of ICALP 2005},
	year={2005},
	publisher={Springer},
	pages={1462--1473},
	series={LNCS 3586}
}

@inproceedings{Graciani:Looking_for_Simple:4thUC:2005,
	author={Carmen Graciani-D{\'i}az and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={Looking for Simple Common Schemes to Design Recognizer {P} Systems with
		Active Membranes That Solve Numerical Decision Problems},
	booktitle={Unconventional Computation 4th International Conference, UC 2005, Sevilla,
		Spain, October 3-�7, 2005. Proceedings},
	year={2005},
	publisher={Springer Berlin / Heidelberg},
	abstract={Earlier solutions to decision problems by means of P systems used many counter
		objects to control the synchronization of different stages in a computation
		(usually as many counters as the stage must last in the worst case). In
		this paper we propose a way to replace those counters with some spacial
		objects for each stage. Furthermore, following the ideas presented in [1],
		in order to have a common scheme to attack numerical problems, all instances
		of a problem with the same size are solved by the same P system (which
		depends on the size) given an input which describes the corresponding instance
		of the problem. We illustrate these ideas with a cellular solution to the
		Subset-Sum problem.},
	series={Lecture Notes in Computer Science},
	volume={3699}
}

@inproceedings{Bonchis:WebPS:3BWMC:2005,
	author={Cosmin Bonchis and Cornel Isbasa and Dana Petcu and Gabriel Ciobanu},
	title={{WebPS}: A web-based {P} system simulator with query facilities},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={63--72}
}

@inproceedings{Bonchis:A_Web-Based:4thUC:2005,
	author={Cosmin Bonchis and Gabriel Ciobanu and Cornel Izbasa and Dana Petcu},
	title={A Web-Based {P} Systems Simulator and Its Parallelization},
	booktitle={Unconventional Computation 4th International Conference, UC 2005, Sevilla,
		Spain, October 3-�7, 2005. Proceedings},
	year={2005},
	publisher={Springer Berlin / Heidelberg},
	abstract={In this paper we present WebPS, an open-source web-enabled simulator for
		P systems, and a P accelerator for parallelization of the existing sequential
		simulators. The simulator is based on CLIPS, and it is already available
		as a web application. The P accelerator is used to parallelize the existing
		sequential simulators of the P systems. We exemplify this tool by using
		a simple CLIPS simulator. The speedup and the efficiency of the resulting
		parallel implementation are surprisingly close to the ideal ones. Combining
		these two ingredients, we get a complex and ready-to-use parallel simulator
		for P systems; no installation are required, no previous knowledge of operating
		systems, parallel programming or specific software.},
	series={Lecture Notes in Computer Science},
	volume={3699}
}

@inproceedings{Lopez:Editing:WMC6:2005,
	author={D. Lopez and J.M. Sempere},
	title={Editing Distances between Membrane Structures},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={485-504}
}

@inproceedings{Pescini:1stWTAPSys:2005,
	author={D. Pescini and D. Besozzi and G. Mauri},
	title={Investigating Local Evolutions in Dynamical Probabilistic P Systems},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={83-90}
}

@inproceedings{Sburlan:Modeling:WMC6:2005,
	author={D. Sburlan},
	title={Modeling the Dynamical Parallelism of Bio-Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {{WMC6}}, Vienna,
		Austria},
	year={2005},
	pages={517-529}
}

@inproceedings{Sburlan:NonCooperative:WMC6:2005,
	author={D. Sburlan},
	title={Non-cooperative P Systems with Priorities Characterize PsET0L},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={530-539}
}

@inproceedings{Pescini:Dynamical_probabilistic:3BWMC:2005,
	author={Dario Pescini and Daniela Besozzi and Claudio Zandron and Giancarlo Mauri},
	title={Dynamical probabilistic {P} systems: Definitions and applications},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={275--288}
}

@inproceedings{Sburlan:Further_results:3BWMC:2005,
	author={Dragos Sburlan},
	title={Further results on {P} systems with promoters/inhibitors},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={289--304}
}

@inproceedings{Csuhaj:EP-colonies:3BWMC:2005,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u}},
	title={{EP}-colonies: Micro-organisms in a cell-like environment},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={123--130}
}

@inproceedings{Arroyo:Software:WMC6:2005,
	author={F. Arroyo and J. Castellanos and L. Fernandez and V.J. Martinez and L.F.
		Mingo},
	title={Software Tools/ P System Simulators Interoperability},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={147-161}
}

@inproceedings{Bernardini:1stWTAPSys:2005,
	author={F. Bernardini and F. J. Romero-Campero and M. Gheorghe and M. J. Perez-Jimenez
		and M. Margenstern and S. Verlan and N. Krasnogor},
	title={On P Systems with Bounded Parallelism},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={31-36}
}

@inproceedings{Bernardini:LNCS3536:2005,
	author={F. Bernardini and M. Gheorghe and N. Krasnogor and G. Terrazas},
	title={Membrane computing. Current results and future problems, New Computational
		Paradigms},
	booktitle={First Conf. on Computability in Europe, CiE2005, Amsterdam},
	year={2005},
	publisher={Springer},
	editor={S. Barry Cooper, B. Lowe and L. Torenvliet},
	pages={49--53},
	series={LNCS 3536}
}

@inproceedings{Bernardini:OnPSystems:WMC6:2005,
	author={F. Bernardini and M. Gheorghe and N. Krasnogor and R.C. Muniyandi and M.J
		Perez Jimenez and F.J. Romero Campero},
	title={On P Systems as a Modelling Tool for Biological Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={193-213}
}

@inproceedings{Bernardini:On_Self-assembly:4thUC:2005,
	author={Francesco Bernardini and Marian Gheorghe and Natalio Krasnogor and Jean-Louis
		Giavitto},
	title={On Self-assembly in Population {P} Systems},
	booktitle={Unconventional Computation 4th International Conference, UC 2005, Sevilla,
		Spain, October 3-�7, 2005. Proceedings},
	year={2005},
	publisher={Springer Berlin / Heidelberg},
	abstract={We introduce a model of self-assembly P systems as devices that use some
		of the features of population P systems to progressively grow a graph structure
		by forming new bonds between the existing cells and some new cells which
		are brought into the system step by step. The new cells are then able to
		self-assemble locally either at the level of cells or at the level of neighbourhoods
		of cells by using bond-making rules according to a specific self-assembly
		model. We describe two self-assembly models, called respectively parallel
		single-point self-assembly and parallel multi-point self-assembly. Then,
		we precisely state the problem of programmable self-assembly for P systems
		as the problem of uniquely generating a given graph by means of self-assembly
		P systems. In this respect, we show how to define a self-assembly P systems
		that uniquely generates a complete binary tree by using a "minimal" set
		of resources.},
	series={Lecture Notes in Computer Science},
	volume={3699}
}

@inproceedings{Bernardini:Turing_machines:EFS_EWCC:2005,
	author={Francesco Bernardini and Marion Gheorghe and N. Krasnogor and Gheorghe P{\u a}un},
	title={Turing machines with cells on the tape},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={61--74}
}

@inproceedings{BelEnguix:1stWTAPSys:2005,
	author={G. Bel Enguix and D. Jimenez Lopez},
	title={Modelling Parallel Phenomena in Conversations with {P} Systems},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={27-30}
}

@inproceedings{Bel_Enguix:LPColonies:WMC6:2005,
	author={G. Bel Enguix and M.D. Jimenez Lopez},
	title={LP Colonies for Language Evolution. A Preview},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={179-192}
}

@inproceedings{BelEnguix:LCMAS:2005,
	author={G. Bel Enguix and M.D. Jimenez-Lopez},
	title={Computing dialogues with membranes},
	booktitle={Logic and Communication in Multi-Agent Systems},
	year={2005},
	series={LCMAS}
}

@inproceedings{Ciobanu:Structural:WMC6:2005,
	author={G. Ciobanu and O. Andrei and D. Lucanu},
	title={Structural Operational Semantics of P Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={1-23}
}

@inproceedings{Ciobanu:Algebraic:WMC6:2005,
	author={G. Ciobanu and V.M. Gontineac},
	title={Algebraic and Coalgebraic Aspects of Membrane Computing},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={289-311}
}

@inproceedings{Franco:Modeling:WMC6:2005,
	author={G. Franco and N. Jonoska and B. Osborn and A. Plaas},
	title={Modeling Knee Injuries by Membrane Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005}
}

@inproceedings{Terrazas:LNCS3536:2005,
	author={G. Terrazas and N. Krasnogor and M. Gheorghe and F. Bernardini and S. Diggle
		and M. Camara},
	title={An environment aware P system model of quorum sensing, New Computational
		Paradigms.},
	booktitle={First Conf. on Computability in Europe, CiE2005, Amsterdam},
	year={2005},
	publisher={Springer},
	editor={S. Barry Cooper, B. Lowe and L. Torenvliet},
	pages={479--485},
	series={LNCS 3536}
}

@inproceedings{Ciobanu:P_accelerators:EFS_EWCC:2005,
	author={Gabriel Ciobanu and Dana Petcu},
	title={P accelerators: Parallelization of sequential simulators},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={177--186}
}

@inproceedings{Ciobanu:branching_complexity:EFS_EWCC:2005,
	author={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={On the branching complexity of {P} systems},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={165--176}
}

@inproceedings{Ciobanu:Mealy_membrane_automata:EFS_EWCC:2005,
	author={Gabriel Ciobanu and M. Gontineac},
	title={Mealy membrane automata and {P} systems complexity},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={149--164}
}

@inproceedings{Paun:1stWTAPSys:2005,
	author={Gh. Paun},
	title={Membrane computing. Basic ideas, results, applications},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={1-8}
}

@inproceedings{Paun:LNCS3536:2005,
	author={Gh. Paun},
	title={Membrane computing: power, efficiency, applications, New Computational Paradigms.},
	booktitle={First Conf. on Computability in Europe, CiE2005, Amsterdam},
	year={2005},
	publisher={Springer},
	editor={S. Barry Cooper, B. Lowe and L. Torenvliet},
	pages={396--407},
	series={LNCS 3536}
}

@inproceedings{Paun:Further_twenty_six_open_problems:3BWMC:2005,
	author={Gheorghe P{\u a}un},
	title={Further twenty six open problems in membrane computing},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={249--262}
}

@inproceedings{Paun:twenty_six_open_problems:3BWMC:2005,
	author={Gheorghe P{\u a}un},
	title={Further twenty-six open problems in membrane computing},
	booktitle={Third Brainstorming Week on Membrane Computing, Sevilla, 2005},
	year={2005},
	address={Sevilla}
}

@inproceedings{Paun:One_more_universality_result:3BWMC:2005,
	author={Gheorghe P{\u a}un},
	title={One more universality result for {P} systems with objects on membranes},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={263--274}
}

@inproceedings{Casiraghi:Amembrane:WMC6:2005,
	author={Giovanni Casiraghi and Claudio Ferretti and A. Gallini and Giancarlo Mauri},
	title={A Membrane Computing System Mapped on an Asynchronous Distributed Computational
		Environment},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={253-260}
}

@inproceedings{Vaszil:On_a_class_of_P_automata:3BWMC:2005,
	author={Gy{\"o}rgy Vaszil},
	title={On a class of {P} automata as a machine model for languages over infinite
		alphabets},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={317--326}
}

@inproceedings{Ardelean:1stWTAPSys:2005,
	author={I. Ardelean},
	title={Could P Systems Model Energy-Sensing Behavior in Bacteria?},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={19-26}
}

@inproceedings{Ardelean:On_modelling_ion_fluxes:3BWMC:2005,
	author={Ioan I. Ardelean and Daniela Besozzi},
	title={On modelling ion fluxes across biological membranes with {P} systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={35--42}
}

@inproceedings{Nepomuceno:A_tool_for_using_the_SBML:3BWMC:2005,
	author={Isabel Nepomuceno and J.A. Nepomuceno and Francisco Jos{\'e} Romero-Campero},
	title={A tool for using the {SBML} format to represent {P} systems which model
		biological reaction networks},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={219--228}
}

@inproceedings{Kleijn:TowardsaPetriNet:WMC6:2005,
	author={J. Kleijn and M. Koutny and G. Rozenberg},
	title={Towards a Petri Net Semantics for Membrane Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={439-460}
}

@inproceedings{Sempere:Recognizing_membrane_structures:3BWMC:2005,
	author={Jos{\'e} M. Sempere and D. L{\'o}pez},
	title={Recognizing membrane structures with tree automata},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={305--316}
}

@inproceedings{Bianco:Psystems:WMC6:2005,
	author={L. Bianco and F. Fontana and V. Manca},
	title={{P} Systems and the Modeling of Biochemical Oscillations},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={214-225}
}

@inproceedings{Bianco:ICNC05:2005,
	author={L. Bianco and F. Fontana and V. Manca},
	title={Reaction-driven membrane systems},
	booktitle={ICNC'05, Changsha, China},
	year={2005},
	month={August}
}

@inproceedings{Bianco:Encoding:WMC6:2005,
	author={L. Bianco and V. Manca},
	title={Encoding-Decoding Classes of P Systems for the Methabolic Algorithm},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={226-234}
}

@inproceedings{Bianco:1stWTAPSys:2005,
	author={L. Bianco and V. Manca and S. Zorzan},
	title={Symbolic Representations of Biological Oscillations},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={37-44}
}

@inproceedings{Cardelli:Abstract_machines_of:3BWMC:2005,
	author={L. Cardelli},
	title={Abstract machines of systems biology (extended abstract)},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={73--86}
}

@inproceedings{Cardelli:An_universality_result:EFS_EWCC:2005,
	author={L. Cardelli and Gheorghe P{\u a}un},
	title={An universality result for a (mem)brane calculus based on mate/drip operations},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={75--94}
}

@inproceedings{Fernandez:1stWTAPSys:2005,
	author={L. Fernandez and V.J. Martinez and F. Arroyo and L.F. Mingo},
	title={A Hardware Circuit for Selecting Active Rules in Transition P Systems},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={45-48}
}

@inproceedings{Bianco:Metabolic_algorithm:3BWMC:2005,
	author={Luca Bianco and Federico Fontana and Vincenzo Manca},
	title={Metabolic algorithm with time-varying reaction maps},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={43--62}
}

@inproceedings{Alfonseca:Multithread:WMC6:2005,
	author={M. Alfonseca and C. Castaneda Marroquin and M. De La Cruz Echeandia and
		R. Nunez-Hervas and A. Ortega de la Puente},
	title={Multithread Java {P} Systems Running on a Cluster of Computers},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={94-101}
}

@inproceedings{Ionescu:BooleanCircuits:WMC6:2005,
	author={M. Ionescu and T.O. Ishdorjþ},
	title={Boolean Circuits and a DNA Algorithm in Membrane Computing},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={410-438}
}

@inproceedings{Muskulus:Sevilla_complexity:EFS_EWCC:2005,
	author={M. Muskulus},
	title={An observation on the Sevilla complexity},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={257--266}
}

@inproceedings{Muskulus:First_steps_towards_a_geometry:3BWMC:2005,
	author={M. Muskulus and R. Brijder},
	title={First steps towards a geometry of computation},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={197--218}
}

@inproceedings{Gutierrez:OnThePower:WMC6:2005,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. Perez Jimenez and A. Riscos Nunez and F.J.
                  Romero Campero},
  title        = {On the Power of Dissolution in P Systems with Active Membranes},
  booktitle    = {Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
  year         = {2005},
  pages        = {373-394},
}

@inproceedings{Gutierrez:ALinearSolution:WMC6:2005,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. Perez Jimenez and F.J. Romero Campero},
  title        = {A Linear Solution for QSAT with Membrane Creation},
  booktitle    = {Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
  year         = {2005},
  pages        = {395-409},
}

@inproceedings{Guttierez-Naranjo:LNCS3561:2005,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez and F.J. Romero-Campero},
  title        = {A linear solution of subset sum problem by using membrane creation},
  booktitle    = {IWINAC 2005, Las Palmas de Gran Canaria},
  year         = {2005},
  publisher    = {Springer},
  editor       = {J. Mira and J.R. Alvarez},
  pages        = {258--267},
  series       = {LNCS 3561},
}

@inproceedings{Perez-Jimenez:IWINAC:2005,
	author={M.J. Perez-Jimenez and F.J. Romero-Campero},
	title={A study of the robustness of the EGFR signalling cascade using continuos
		membrane systems},
	booktitle={First Intern. Work-Conference on the Interplay between Natural and Artificial
		Computation, IWINAC 2005},
	year={2005},
	address={Las Palmas de Gran Canaria}
}

@inproceedings{Pérez-Jiménez:complexity_aspects:EFS_EWCC:2005,
	author={Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Computational complexity aspects of membrane computing: Ideas, results,
		open problems},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={277--292}
}

@inproceedings{Cavaliere:Inhibiting:EFS_EWCC:2005,
	author={Matteo Cavaliere and Mihai Ionescu and Tseren-Onolt Ishdorj},
	title={Inhibiting/de-inhibiting {P} systems with active membranes},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={117--130}
}

@inproceedings{Cavaliere:Event-related_outputs:3BWMC:2005,
	author={Matteo Cavaliere and Rudolf Freund and A. Leitsch and Gheorghe P{\u a}un},
	title={Event-related outputs of computations in {P} systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={107--122}
}

@inproceedings{Cavaliere:Specifying_dynamic_software:3BWMC:2005,
	author={Matteo Cavaliere and Vincenzo Deufemia},
	title={Specifying dynamic software architectures by using membrane systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={87--106}
}

@inproceedings{Cavaliere:Further_results:EFS_EWCC:2005,
	author={Matteo Cavaliere and Vincenzo Deufemia},
	title={Further results on time-free {P} systems},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={95--116}
}

@inproceedings{GutierrezNaranjo:P_Systems_with:4thUC:2005,
	author={Miguel A. Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco J. Romero-Campero},
	title={{P} Systems with Active Membranes, Without Polarizations and Without Dissolution:
		A Characterization of {P}},
	booktitle={Unconventional Computation 4th International Conference, UC 2005, Sevilla,
		Spain, October 3-�7, 2005. Proceedings},
	year={2005},
	publisher={Springer Berlin / Heidelberg},
	abstract={We study the computational efficiency of recognizer P systems with active
		membranes without polarizations and without dissolution. The main result
		of the paper is the following: the polynomial computational complexity
		class associated with the class of recognizer P systems is equal to the
		standard complexity class P.},
	series={Lecture Notes in Computer Science},
	volume={3699}
}

@inproceedings{Gutiérrez:Converting_integer:EFS_EWCC:2005,
	author={Miguel Angel Guti{\'e}rrez-Naranjo and Alberto Leporati and Claudio Zandron},
	title={Converting integer numbers from binary to unary notation with {P} systems},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={201--208}
}

@inproceedings{Gutierrez:SolvingSAT_mem_Creation:CiE2005:2005,
	author={Miguel Angel Guti{\'e}rrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Francisco
		Jos{\'e} Romero-Campero},
	title={Solving {SAT} with membrane creation},
	booktitle={CiE2005: New Computational Paradigms},
	year={2005},
	address={Amsterdam}
}

@inproceedings{Gutiérrez:and_rule_input:EFS_EWCC:2005,
	author={Miguel Angel Guti{\'e}rrez-Naranjo and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={P systems with membrane creation and rule input},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={209--224}
}

@inproceedings{Gutiérrez:A_simulator_for_confluent:3BWMC:2005,
	author={Miguel Angel Guti{\'e}rrez-Naranjo and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Agust{\'i}n
		Riscos-N{\'u}{\~n}ez},
	title={A simulator for confluent {P} systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={169--184}
}

@inproceedings{Gutiérrez:Multidimensional_Sev_C:EFS_EWCC:2005,
	author={Miguel Angel Guti{\'e}rrez-Naranjo and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Agust{\'i}n
		Riscos-N{\'u}{\~n}ez},
	title={Multidimensional Sevilla carpets associated with {P} systems},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={225--236}
}

@inproceedings{Gutiérrez:Simulating_avascular_tumors:3BWMC:2005,
	author={Miguel Angel Guti{\'e}rrez-Naranjo and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Francisco
		Jos{\'e} Romero-Campero},
	title={Simulating avascular tumors with membrane systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={185--196}
}

@inproceedings{Barbacari:Gene:WMC6:2005,
	author={N. Barbacari and A. Profir and C. Zelinschi},
	title={Gene Regulatory Network Modelling by Means of Membrane Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={162-178}
}

@inproceedings{Busi:OnTheComputational:WMC6:2005,
	author={N. Busi},
	title={On the Computational Power of the Mate/Bud/Drip Brane Calculus: Interleaving
		vs. Maximal Parallelism},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={235-252}
}

@inproceedings{Andrei:SOS:2005,
	author={O. Andrei and G. Ciobanu and D. Lucanu},
	title={Operational semantics and rewriting logic in membrane computing},
	booktitle={Proceedings SOS Workshop (to appear in ENTCS)},
	year={2005}
}

@inproceedings{Ibarra:1stWTAPSys:2005,
	author={O. Ibarra and S. Woodworth},
	title={On Symport/Antiport P Systems with One or Two Symbols},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={75-82}
}

@inproceedings{Ibarra:Some_Recent:WMC6:2005,
	author={O.H. Ibarra},
	title={Some Recent Results Concerning Deterministic P Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={24-25}
}

@inproceedings{Ibarra:DNA11:2005,
	author={O.H. Ibarra and A. Paun},
	title={Counting time in computing with cells},
	booktitle={DNA11, London, Ontario, Canada},
	year={2005}
}

@inproceedings{Ibarra1:DNA11:2005,
	author={O.H. Ibarra and S. Woodworth},
	title={On bounded symport/antiport P systems},
	booktitle={DNA11, London, Ontario, Canada},
	year={2005}
}

@inproceedings{Cazzaniga:Psystems:WMC6:2005,
	author={P. Cazzaniga and A. Leporati and G. Mauri and C. Zandron},
	title={P Systems with Memory},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={261-281}
}

@inproceedings{Frisco:PetriNets:WMC6:2005,
	author={P. Frisco and P Systems},
	title={Petri Nets and Program Machine},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={336-354}
}

@inproceedings{Frisco:1stWTAPSys:2005,
	author={P. Frisco and Ranulf T. Gibson},
	title={A Simulator and an Evolution Program for Conformon-{P} Systems},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={57-60}
}

@inproceedings{Sosik:Evolutionary:WMC6:2005,
	author={P. Sosik},
	title={On Evolutionary Lineages of Membrane Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={79-93}
}

@inproceedings{Chandra:OnPicture:WMC6:2005,
	author={P.H. Chandra and K.G. Subramanian},
	title={On Picture Arrays Generated by P Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={282-288}
}

@inproceedings{Frisco:Asimulator:WMC6:2005,
	author={Pierluigi Frisco and Ranulf T. Gibson},
	title={A Simulator for Conformon {P} Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={355-372}
}

@inproceedings{Freund:1stWTAPSys:2005,
	author={R. Freund and M. Oswald},
	title={P Colonies Working in the Maximally Parallel and in the Sequential Mode},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={49-56}
}

@inproceedings{Rama:1stWTAPSys:2005,
	author={R. Rama and H. Ramesh},
	title={On Generating Trees by P Systems with Active Membranes},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={95-98}
}

@inproceedings{Ceterchi:Simulating_a_class_of:EFS_EWCC:2005,
	author={Rodica Ceterchi and Mario Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Simulating a class of parallel architectures: A broader perspective},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={131--148}
}

@inproceedings{Freund:Tissue_P_systems:EFS_EWCC:2005,
	author={Rudolf Freund and Marion Oswald},
	title={Tissue {P} systems with symport/antiport rules of one symbol are computationally
		universal},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={187--200}
}

@inproceedings{Freund:Matrix_languages:3BWMC:2005,
	author={Rudolf Freund and Oscar H. Ibarra and Gheorghe P{\u a}un and H.-C. Yen},
	title={Matrix languages, register machines, vector addition systems},
	booktitle={Proceedings of the {T}hird {B}rainstorming {W}eek on {M}embrane {C}omputing,
		{S}evilla ({S}pain), {J}anuary 31st - {F}ebruary 4th},
	year={2005},
	pages={155--168}
}

@inproceedings{Hemalatha:1stWTAPSys:2005,
	author={S.Hemalatha and K.S.Dersanambika and K.G.Subramanian and C. Sri Hari Nagore},
	title={P Systems Generating 3D Rectangular Picture Languages},
	booktitle={in G. Ciobanu, Gh. Paun, Pre-Proc. of First International Workshop on Theory
		and Application of P Systems, Timisoara, Romania, September 26-27},
	year={2005},
	pages={69-74}
}

@inproceedings{Krishna:mobile_membranes:EFS_EWCC:2005,
	author={Shankara Narayanan Krishna},
	title={On the efficiency of a variant of {P} systems with mobile membranes},
	booktitle={Proceedings of the {ESF} {E}xploratory {W}orkshop on {C}ellular {C}omputing
		({C}omplexity {A}spects), {S}evilla ({S}pain), {J}anuary 31st - {F}ebruary
		2nd},
	year={2005},
	pages={237--246}
}

@inproceedings{Krishna:Mobility_four_Menbranes:CiE2005:2005,
	author={Shankara Narayanan Krishna},
	title={The power of mobility: four membranes suffice},
	booktitle={CiE2005: New Computational Paradigms},
	year={2005},
	address={Amsterdam}
}

@inproceedings{Nishida:Membrane:WMC6:2005,
	author={T.Y. Nishida},
	title={Membrane Algorithm: An Approximate Algorithm for NP-Complete Optimization
		Problems Eploiting P Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={26-43}
}

@inproceedings{Korczynski:Paun:2005,
	author={W. Korczynski},
	title={Paun's Systems and Accounting},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={461-464}
}

@inproceedings{Rogozhin:Computational:WMC6:2005,
	author={Y. Rogozhin and A. Alhazov and R. Freund},
	title={Computational Power of Symport/Antiport: History, Advances and Open Problems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={44-78}
}

@inproceedings{Rogozhin:OnTheRule:WMC6:2005,
	author={Y. Rogozhin and S. Verlan},
	title={On the Rule Complexity of Universal Tissue P Systems},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={510-516}
}

@inproceedings{Dang:OnSymportAntiport:WMC6:2005,
	author={Z. Dang and O.H. Ibarra and S. Woodworth and H.C. Yen},
	title={On Symport/Antiport Systems and Semilinear Sets},
	booktitle={Pre-Proc. of the sixth Workshop on Membrane Computing, {WMC6}, Vienna, Austria},
	year={2005},
	pages={312-335}
}

@inproceedings{Dang:On_Model-Checking:4thUC:2005,
	author={Zhe Dang and Oscar H. Ibarra and Cheng Li and Gaoyan Xie},
	title={On Model-Checking of {P} Systems},
	booktitle={Unconventional Computation 4th International Conference, UC 2005, Sevilla,
		Spain, October 3-�7, 2005. Proceedings},
	year={2005},
	publisher={Springer Berlin / Heidelberg},
	abstract={Membrane computing is a branch of molecular computing that aims to develop
		models and paradigms that are biologically motivated. It identifies an
		unconventional computing model, namely a P system, from natural phenomena
		of cell evolutions and chemical reactions. Because of the nature of maximal
		parallelism inherent in the model, P systems have a great potential for
		implementing massively concurrent systems in an efficient way that would
		allow us to solve currently intractable problems. In this paper, we look
		at various models of P systems and investigate their model-checking problems.
		We identify what is decidable (or undecidable) about model-checking these
		systems under extended logic formalisms of CTL. We also report on some
		experiments on whether existing conservative (symbolic) model-checking
		techniques can be practically applied to handle P systems with a reasonable
		size. The work by Zhe Dang, Cheng Li and Gaoyan Xie was supported in part
		by NSF Grant CCF-0430531. The work by Oscar H. Ibarra was supported in
		part by NSF Grant CCF-0430945.},
	series={Lecture Notes in Computer Science},
	volume={3699}
}

@inproceedings{Alhazov:Minimal_Parallelism_and:WMC7:2006,
	author={A. Alhazov},
	title={Minimal Parallelism and Number of Membrane Polarizations},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={74-87}
}

@inproceedings{Alhazov:Extended_Spiking:WMC7:2006,
	author={A. Alhazov and R. Freund and M. Oswald and M. Slavkovik},
	title={Extended Spiking Neural P Systems Generating Strings and Vectors of Non-Negative
		Integers},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={88-101}
}

@inproceedings{Alhazov:Towards_a_Characterization_of:WMC7:2006,
	author={A. Alhazov and Y. Rogozhin},
	title={Towards a Characterization of P Systems with Minimal Symport/Antiport and
		Two Membranes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={102-118}
}

@inproceedings{Binder:Applications_of:BIC-TA:2006,
	author={A. Binder and R. Freund and G. Lojka and M. Oswald},
	title={Applications of membrane systems in distributed systems},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Binder:Applications,
	author={A. Binder and R. Freund and G. Lojka and M. Oswald},
	title={Applications of membrane systems in distributed systems},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={37--50}
}

@inproceedings{Leporati:Solving,
	author={A. Leporati and C. Zandron and G. Mauri},
	title={Solving the factorization problem with P systems},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={144--153}
}

@inproceedings{Leporati:Solving_the_factorization:BIC-TA:2006,
	author={A. Leporati and C. Zandron and G. Mauri},
	title={Solving the factorization problem with P systems},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Obtulowicz:Mathematical_(Denotational)_Semantics:W,
	author={A. Obtulowicz},
	title={Mathematical (Denotational) Semantics of Some Reducts of Ambient Calculus
		and Brane Calculi},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={443-454}
}

@inproceedings{Obtulowicz:Mathematical_(Denotational)_Semantics:WMC7:2006,
	author={A. Obtulowicz},
	title={Mathematical (Denotational) Semantics of Some Reducts of Ambient Calculus
		and Brane Calculi},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={443-454}
}

@inproceedings{Paun:P_systems_with_proteins:DTL10:2006,
	author={A. Paun and  B. Popa},
	title={P systems with proteins on membranes and membrane division},
	booktitle={Proceedings 10th DLT Conf. (invited talk), Santa Barbara, USA, 2006},
	year={2006},
	publisher={Springer},
	pages={292--303},
	series={Lecture Notes in Computer Science},
	volume={4036}
}

@inproceedings{Romero-Jimenez:Graphical_Modelling_of:WMC7:2006,
  author       = {A. Romero-Jimenez and M.A. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez},
  title        = {Graphical Modelling of Higher Plants Using P Systems},
  booktitle    = {Pre-proceedings of Membrane Computing, International Workshop, WMC7},
  year         = {2006},
  address      = {Leiden, The Netherlands},
  editor       = {H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
  pages        = {474-484},
}

@inproceedings{Vitale:Communication,
	author={A. Vitale and G. Mauri},
	title={Communication via mobile vesicles in brane calculi},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Obtulowicz:On_an_Idea:4BWMC:2006,
	author={Adam Obtulowicz},
	title={On an Idea of a (Possibly) Uniform Data Base for Life Sciences from Molecular
		Biology to Cognitive Psychology},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={209--212}
}

@inproceedings{Leporati:Three_Quantum:4BWMC:2006,
	author={Alberto Leporati and  Sara Felloni},
	title={Three Quantum Algorithms to Solve {3-SAT}},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={137--160},
	abstract={We propose three quantum algorithms to solve the 3-SAT NP-complete decision
		problem. The first algorithm builds, for any instance o of 3-SAT, a quantum
		Fredkin circuit that computes a superposition of all classical evaluations
		of o in a given output line. Similarly, the second and third algorithms
		compute the same superposition on a given register of a quantum register
		machine, and as the energy of a given membrane in a quantum P system, respectively.
		Assuming that a specific non-unitary operator, built using the well known
		creation and annihilation operators, can be realized as a quantum gate,
		as an instruction of the quantum register machine, and as a rule of the
		quantum P system, respectively, we show how to decide whether {\'A} is a positive
		instance of 3-SAT. The construction relies also upon the assumption that
		an external observer is able to distinguish, as the result of a measurement,
		between a null and a non-null vector.}
}

@inproceedings{Romero_Jimenez:The_Growth:4BWMC:2006,
	author={Alvaro Romero-Jim{\'e}nez and Miguel Angel Guti{\'e}rrez-Naranjo and Mario-Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={The Growth of Branching Structures with {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={253--266},
	abstract={L-systems have been widely used to model and graphically represent the growth
		of plants [18]. In [4], the use of membrane computing for such tasks has
		been proposed. In this paper we present a different approach, which makes
		use of the topology of membrane structures to model the morphology of branching
		structures. We also keep closer to reality by simulating their growth from
		buds, instead of rewriting existing structures, as L-systems do.}
}

@inproceedings{APaun:Small_Universal:4BWMC:2006,
	author={Andrei Paun and  Gheorghe Paun},
	title={Small Universal Spiking Neural {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={213--234},
	abstract={In search for small universal computing devices of various types, we consider
		here the case of spiking neural P systems (SN P systems), in two versions:
		as devices computing functions and as devices generating sets of numbers.
		We start with the first case and we produce a universal spiking neural
		P system with 84 neurons. If a slight generalization of the used rules
		is adopted, namely, we allow rules for producing simultaneously several
		spikes, then a considerable improvement, to 49 neurons, is obtained. For
		SN P systems used as generators of sets of numbers, we find a universal
		system with restricted rules having 76 neurons, and one with extended rules
		having 50 neurons.}
}

@inproceedings{Alhazov:Encodings:4BWMC:2006,
	author={Artiom Alhazov and Cosmin Bonchis and  Gabriel Ciobanu and Cornel Izbasa},
	title={Encodings and Arithmetic Operations in {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={1--28},
	abstract={Following [2], we present in this paper various number encodings and operations
		over multisets. We obtain the most compact encoding and several other interesting
		encodings and study their properties using elements of combinatorics over
		multisets. We also construct P systems that implement their associated
		operations. We quantify the effect of adding order to multiset thus obtaining
		a string, as going from encoding lengths of the number n in base b and
		time complexities of operations of the order pb n to lengths and complexities
		of order logbn.}
}

@inproceedings{Alhazov:Uniform:4BWMC:2006,
	author={Artiom Alhazov and Mario de Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Uniform Solution to {QSAT} Using Polarizationless Active Membranes},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={29--40},
	abstract={It is known that the satisfiability problem (SAT) can be solved a semi-uniform
		family of deterministic polarizationless P systems with active membranes
		with non elementary membrane division. We present a double improvement
		of this result by showing that the satisfiability of a quantified boolean
		formula (QSAT) can be solved by a uniform family of P systems of the same
		kind.}
}

@inproceedings{Aman:Translating,
	author={B. Aman and G. Ciobanu},
	title={Translating mobile ambients into P systems},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Bonchis:Compositional,
	author={C. Bonchis and C. Isbasa and G. Ciobanu},
	title={Compositional asynchronous membrane systems},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={51--59}
}

@inproceedings{Bonchis:Compositional_asynchronous:BIC-TA:2006,
	author={C. Bonchis and C. Isbasa and G. Ciobanu},
	title={Compositional asynchronous membrane systems},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Versari:Encoding,
	author={C. Versari},
	title={Encoding catalytic P systems in $\pi$@},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Besozzi:Extended_P_Systems:WMC7:2006,
	author={D. Besozzi and G. Rozenberg},
	title={Extended P Systems for the Analysis of (Trans)Membrane Proteins},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={8-9}
}

@inproceedings{Besozzi:Seasonal_variance:BIC-TA:2006,
	author={D. Besozzi and P. Cazzaniga and D. Pescini and G. Mauri},
	title={Seasonal variance in P systems models for metapopulations},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Besozzi:Seasonal,
	author={D. Besozzi and P. Cazzaniga and D. Pescini and G. Mauri},
	title={Seasonal variance in P system models for metapopulations},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={27--36}
}

@inproceedings{Diaz-Pernil:solution,
  author       = {D. Diaz-Pernil and M.A. Guti{\'e}rrez-Naranjo and M.J. P{\'e}rez-Jim{\'e}nez and A. Riscos-N{\'u}{\~n}ez},
  title        = {An efficient solution to 3-COL with tissue P systems},
  booktitle    = {Proceedings MeCBIC 2006},
  year         = {2006},
  address      = {Venice},
  editor       = {N. Busi and C. Zandron},
}

@inproceedings{Zaharie:Distributed_Evolutionary_Algorithms:WMC7:2,
	author={D. Zaharie and G. Ciobanu},
	title={Distributed Evolutionary Algorithms Inspired by Membranes in Solving Continuous
		Optimization Problems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={522- 537}
}

@inproceedings{Zaharie:Distributed_Evolutionary_Algorithms:WMC7:2006,
	author={D. Zaharie and G. Ciobanu},
	title={Distributed Evolutionary Algorithms Inspired by Membranes in Solving Continuous
		Optimization Problems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={522- 537}
}

@inproceedings{Das:A_Simulator_Model:IEEECETN:2006,
	author={D.K. Das and T. Renz},
	title={A simulator model for P systems with active membranes},
	booktitle={Proceedings 2006 IEEE Conference on Emerging Technologies - Nanoelectronics},
	year={2006},
	month={January},
	address={Singapore},
	pages={338--340}
}

@inproceedings{Diaz_Pernil:Solving_3_COL:4BWMC:2006,
	author={Daniel D{\'i}az-Pernil and Miguel-Angel Guti{\'e}rrez-Naranjo and Mario-Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Solving 3-COL with Tissue {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={17--30},
	abstract={In the literature, several examples of the efficiency of cell-like P systems
		in order to solve NP-complete problems in polynomial time can be found.
		Recently, various new models of tissue-like P systems have received important
		attention from the scientific community. In this paper we present a linear-time
		solution to an NP-complete problem, the 3-COL problem, and discuss the
		possibilities of tissue-like P systems to solve hard problems.}
}

@inproceedings{Besozzi:Two_Universality:4BWMC:2006,
	author={Daniela Besozzi and Nadia Busi and Giuditta Franco and Rudolf Freund and
		Gheorghe Paun},
	title={Two Universality Results for (Mem)Brane Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={49--62},
	abstract={We prove that P systems with mate and drip operations and using at most
		five membranes during any step of a computation are universal. This improves
		a recent similar result from [5], where eleven membranes are used. The
		proof of this result has the "drawback" that the output of a computation
		is obtained on an inner membrane of the system. A universality proof is
		then given for the case when the result of a computation is found on the
		skin membrane (on its external side, hence "visible" from the environment),
		but in this case we use one more membrane, as well as another basic brane
		operation exo; moreover, the operations are now of the projective type,
		as introduced in [1].}
}

@inproceedings{Csuhaj-Varju:P_Colonies_with:WMC7:2006,
	author={E. Csuhaj-Varju and M. Margenstern and G. Vaszil},
	title={P Colonies with a Bounded Number of Cells and Programs},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={311-322}
}

@inproceedings{Csuhaj-Varju:Modeling_the_Dynamical_Parallelism:WMC7:2006,
	author={E. Csuhaj-Varju and R. Freund and D. Sburlan},
	title={Modeling the Dynamical Parallelism of Bio-Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={290-310}
}

@inproceedings{Csuhaj-Varju:Modeling_the_Dynamical_Parallelism:WM,
	author={E. Csuhaj-Varju and R. Freund and D. Sburlan},
	title={Modeling the Dynamical Parallelism of Bio-Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={290-310}
}

@inproceedings{Martegani:Identification_of:ISSY25:2006,
	author={E. Martegani and R. Tisi and F. Belotti and S. Colombo and C. Paiardi and
		J. Winderickx and P. Cazzaniga and D. Besozzi and G. Mauri},
	title={Identification of an intracellular signalling complex for ras/camp pathway
		in yeast: experimental evidences and modelling},
	booktitle={ISSY 25 Conf., Hanassari, Espo, Finland, 2006},
	year={2006}
}

@inproceedings{CsuhagVarju:Small_Computationaly:4BWMC:2006,
	author={Erzs{\'e}bet Csuhaj-Varj{\'u} and Maurice Margenstern and Gy{\"o}rgy Vaszil and Sergei
		Verlan},
	title={Small Computationally Complete Symport/Antiport {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={267--282},
	abstract={It is known that P systems with symport/antiport rules simulate the register
		machines, i.e., they are computationally complete. Hence, due to the existence
		of universal register machines, there exist computationally complete subclasses
		of symport/antiport P systems with a number of rules limited by a constant.
		However, there was no estimation of this number in the literature. In this
		article, we first give a simple estimation of this constant, and then we
		show that the number can be reduced by grouping together several instructions
		of the simulated variant of the register machines. Finally, a universal
		P system with symport/antiport having only 44 rules is obtained.}
}

@inproceedings{Bernardini:Tissue_P_Systems_with:WMC7:2006,
	author={F. Bernardini and R. Freund},
	title={Tissue P Systems with Communication Modes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={132-144}
}

@inproceedings{Romero-Campero:Towards_Probabilistic_Model:WMC7:2006,
	author={F.J. Romero-Campero and M. Gheorghe and L. Bianco and D. Pescini and M.J.
		Perez-Jimenez and R. Ceterchi},
	title={Towards Probabilistic Model Checking on P Systems Using PRISM},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={455-473}
}

@inproceedings{Romero-Campero:Towards_Probabilistic_Model:WMC7:20,
	author={F.J. Romero-Campero and M. Gheorghe and L. Bianco and D. Pescini and M.J.
		Perez-Jimenez and R. Ceterchi},
	title={Towards Probabilistic Model Checking on P Systems Using PRISM},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={455-473}
}

@inproceedings{Fontana:Discrete_Solution:4BWMC:2006,
	author={Federico Fontana and Vicenzo Manca},
	title={Discrete Solution of Differential Equations by {P} Metabolic Algorithm},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={31--40},
	abstract={The relationships existing between MP graphs, metabolic P systems, and ODE
		systems are investigated. Formal results show that every MP system, once
		derived by its MP graph, results in an ODE system whose solution equals,
		in the limit, the solution obtained by a non-cooperative MP system that
		is ODE equivalent to the original one. The freedom of choice of the ODE
		equivalent from the original MP system resembles the same freedom which
		is left in the choice and optimization of a numerical scheme while computing
		the solution of an ODE system.}
}

@inproceedings{Ciobanu:Probabilistic_transitions:BIC-TA:2006,
  author       = {G. Ciobanu and L. Corn{\u a}cel},
  title        = {Probabilistic transitions for P systems},
  booktitle    = {Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006
                  Wuhan, China, September 2006, Membrane Computing Section.},
  year         = {2006},
}

@inproceedings{Ciobanu:Probabilistic,
  author       = {G. Ciobanu and L. Corn{\u a}cel},
  title        = {Probabilistic transitions for P systems},
  booktitle    = {Pre-proceedings of International Conference on Bio-Inspired Computing -
                  Theory and Applications, BIC-TA 2006, Membrane Computing Section},
  year         = {2006},
  month        = {September},
  address      = {Wuhan, China},
  pages        = {82--92},
}

@inproceedings{Ciobanu:P_Machines:WMC7:2006,
	author={G. Ciobanu and M. Gontineac},
	title={P Machines: An Automata Approach to Membrane Computing},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={274-289}
}

@inproceedings{Franco:Computing,
	author={G. Franco and M. Margenstern},
	title={Computing by floating strings},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Franco:Mitotic_Oscillators:WMC7:2006,
	author={G. Franco and P.H. Guzzi and V. Manca and T. Mazza},
	title={Mitotic Oscillators as MP Graphs},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={344-356}
}

@inproceedings{Liu:Further_Remarks_on:WMC7:2006,
	author={G. Liu and M. Ionescu},
	title={Further Remarks on Trace Languages in P Systems with Symport/Antiport},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={417-428}
}

@inproceedings{Paun:Tissue,
	author={Gh. Paun},
	title={Membrane computing and brane calculi (some personal notes)},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Paun:Languages,
	author={Gh. Paun},
	title={Languages in membrane computing. Some details for spiking neural P systems},
	booktitle={Proceedings 10th DLT Conf. (invited talk), Santa Barbara, USA, 2006},
	year={2006},
	publisher={Springer},
	pages={20--35},
	series={Lecture Notes in Computer Science},
	volume={4036}
}

@inproceedings{Paun:2006_Research_Topics:4BWMC:2006,
  author       = {Gheorghe P{\u a}un},
  title        = {2006 Research Topics in Membrane Computing},
  booktitle    = {Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
                  3, 2006. Volume II},
  year         = {2006},
  publisher    = {F{\'e}nix Editora},
  editor       = {Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
                  and Francisco Jos{\'e} Romero-Campero},
  pages        = {235--252},
  abstract     = {This is a list of research topics prepared on the occasion of the Fourth
                  Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
                  3, 2006 (hence the title). The selection is subjective, the presentation
                  is informal (in most cases, the precise formulation of the question to
                  investigate is already part of the research task), the bibliographical
                  information is partial (giving only a starting point for searching the
                  literature; as usual, for a complete bibliography the reader should refer
                  to [36]).},
}

@inproceedings{Liu:Further_Remarks:4BWMC:2006,
	author={Guangwu Liu and Mihai Ionescu},
	title={Further Remarks on Trace Languages in {P} Systems with Symport/Antiport},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={161--172},
	abstract={P systems are parallel molecular computing models which process multisets
		of objects in cell-like membrane structures. In this paper we consider
		the trace languages of a special symbol, the traveler, in symport/antiport
		P systems where, instead of multisets of objects, sets of objects were
		considered. Two different ways to define the trace language are proposed.
		One of the families of languages obtained in this way is proved to be equal
		to the family of regular languages and the other one to be strictly smaller.
		Some ideas for further research are also considered.}
}

@inproceedings{Vaszil:A_Class_of_P_Automata:4BWMC:2006,
	author={Gy{\"o}rgy Vaszil},
	title={A Class of {P} Automata for Characterizing Context-free Languages},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={267--276},
	abstract={We present a characterization of context-free languages in terms of a restricted
		class of P automata (P systems accepting strings of symbols using symport/antiport
		communication rules). The characterization is based on the form of the
		rules used by the system.}
}

@inproceedings{Chen:Computing,
	author={H. Chen and T.-O. Ishdorj and Gh. Paun},
	title={Computing along the axon},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={60--70}
}

@inproceedings{Long:Building,
	author={H. Long and Y. Fu},
	title={Building combinational P automata with rewriting and active membrane rules},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={154--159}
}

@inproceedings{Long:Building_combinational:BIC-TA:2006,
	author={H. Long and Y. Fu},
	title={Building combinational P automata with rewriting and active membrane rules},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Nagda:Symport/Antiport_and_Time:WMC7:2006,
	author={H. Nagda and A. Paun and A. Rodriguez-Paton},
	title={P Systems with Symport/Antiport and Time},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={429-442}
}

@inproceedings{Chen:On_Trace_Languages:4BWMC:2006,
	author={Haiming Chen and Mihai Ionescu and Andrei Paun and Gheorghe Paun and Bianca
		Popa},
	title={On Trace Languages Generated by Spiking Neural {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={207--224},
	abstract={We extend to spiking neural P systems a notion investigated in the �standard�
		membrane systems: the language of the traces of a distinguished object.
		In our case, we distinguish a spike by �marking� it and we follow its path
		through the neurons of the system, thus obtaining a language. Several examples
		are discussed and some preliminary results about this way of associating
		a language with a spiking neural P system are given, together with a series
		of topics for further research. For instance, we show that each regular
		language is the morphic image of a trace language intersected with a very
		particular regular language, while each recursively enumerable language
		over the one-letter alphabet is the projection of a trace language.}
}

@inproceedings{Chen:On_The_Efficiency:4BWMC:2006,
	author={Haiming Chen and Mihai Ionescu and Tseren-Onolt Ishdorj},
	title={On the Efficiency of Spiking Neural {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={195--206},
	abstract={Spiking neural P systems were recently introduced in [4] and proved to be
		Turing complete as number computing devices. In this paper we show that
		these systems are also computationally efficient. Specifically, we present
		a variant of spiking neural P systems which have, in their initial configuration,
		an arbitrarily large number of inactive neurons which can be activated
		(in an exponential number) in polynomial time. Using this model of P systems
		we can deterministically solve the satisfiability problem (SAT) in constant
		time.}
}

@inproceedings{Chen:On_String_Languages:4BWMC:2006,
	author={Haiming Chen and Rudolf Freund and Mihai Ionescu and Gheorghe Paun and Mario-Jes{\'u}s
		P{\'e}rez-Jim{\'e}nez},
	title={On String Languages Generated by Spiking Neural {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={169--194},
	abstract={We continue the study of spiking neural P systems by considering these computing
		devices as binary string generators: the set of spike trains of halting
		computations of a given system constitutes the language generated by that
		system. Although the work of spiking neural P systems is rather restricted
		(and this is illustrated by the fact that very simple languages cannot
		be generated in this framework), regular languages are inverse-morphic
		images of languages of finite spiking neural P systems, and recursively
		enumerable languages are projections of inverse-morphic images of languages
		generated by spiking neural P systems.}
}

@inproceedings{Chen:Computing_Along_Axon:4BWMC:2006,
	author={Haiming Chen and Tseren-Onolt Ishdorj and Gheorghe Paun},
	title={Computing Along the Axon},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={225--240},
	abstract={We consider a special form of spiking neural P systems, called axon P systems,
		corresponding to the activity of Ranvier nodes of neuron axon, and we brieffy
		investigate the language generative power of these devices.}
}

@inproceedings{Chen:Spiking_Neural:4BWMC:2006,
	author={Haiming Chen and Tseren-Onolt Ishdorj and Gheorghe Paun and Mario-Jes{\'u}s
		P{\'e}rez-Jim{\'e}nez},
	title={Spiking Neural {P} Systems with Extended Rules},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={241--266},
	abstract={We consider spiking neural P systems with spiking rules allowed to introduce
		zero, one, or more spikes at the same time. The computing power of the
		obtained systems is investigated, when considering them as number generating
		and as language generating devices. In the first case, a simpler proof
		of universality is obtained (universality is already known for the restricted
		rules), while in the latter case we find characterizations of finite and
		recursively enumerable languages (without using any squeezing mechanism,
		as it was necessary in the case of restricted rules). The relationships
		with regular languages are also investigated. In the end of the paper,
		a tool-kit for computing (some) operations with languages is provided.}
}

@inproceedings{Ardelean:Biological_Roots:WMC7:2006,
	author={I. Ardelean},
	title={Biological Roots and Applications of P Systems. Further Suggestions},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={1-7}
}

@inproceedings{Ardelean:Some_Notes:4BWMC:2006,
	author={I. Ioan Ardelean and Daniela Besozzi},
	title={Some Notes on the Interplay Between {P} Systems and Chemotaxis in Bacteria},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={41--48},
	abstract={We describe some chemotactic behaviors of bacteria, that is, their movement
		response to changes in the environment, and the underlying molecular mechanisms.
		We outline how such processes could be linked to membrane computing, by
		taking inspiration from them for new type of rules or new features to be
		introduced in P systems, as well as by considering how the application
		of recent P system-based models can produce relevant results for the description
		and the analysis of chemotaxis processes.}
}

@inproceedings{Auld:Study_of_Colonies:WMC7:2006,
	author={J. Auld and L. Bianco and G. Ciobanu and M. Gheorghe and D. Pescini and
		F.J. Remero-Campero},
	title={The Use of P Systems for the Study of Colonies},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={15-20}
}

@inproceedings{Bartosik:Membrany_dynamicsne:CBOiS:2006,
	author={J. Bartosik},
	title={Membrany dynamicsne w modelowaniu systemow ekonomicznych},
	booktitle={Conf. Bad. Oper. i Syst.},
	year={2006}
}

@inproceedings{Dassow:complexity_Darwinian:BWMC4:2006,
	author={J. Dassow and E. Csuhaj-Varju},
	title={On the syntactic complexity of Darwinian membrane systems},
	booktitle={BWMC4},
	year={2006},
	address={Sevilla}
}

@inproceedings{Dassow:P,
	author={J. Dassow and G. Vaszil},
	title={P Finite Automata and Regular Languages Over Countably Infinite Alphabets},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={323-336}
}

@inproceedings{Kleijn:Synchrony_and_Asynchrony:WMC7:2006,
	author={J. Kleijn and M. Koutny},
	title={Synchrony and Asynchrony in Membrane Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={21-39}
}

@inproceedings{Sempere:Identifying_P_Rules:WMC7:2006,
	author={J.M. Sempere and D. Lopez},
	title={Identifying P Rules from Membrane Structures with an Error-Correcting Approach},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={485-500}
}

@inproceedings{Dassow:On_the_Syntactic:4BWMC:2006,
	author={J{\"u}rgen Dassow and Erzs{\'e}bet Csuhaj-Varj{\'u}},
	title={On the Syntactic Complexity of Darwinian Membrane Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={1--16},
	abstract={Membrane or P systems form a distributed parallel model of computing which
		is obtained as an abstraction from the structure and functioning of living
		cells. In this paper we consider a very basic membrane system and add to
		it checkers which are special finite automata to check whether or not a
		configuration of the membrane system is "good" or "bad". The computation
		is only continued if the configuration is good, otherwise it stops without
		a result. Such membrane systems are called Darwinian P systems. There are
		three parameters characterizing the size of a system, the number of membranes,
		the number of checkers, and the size of the checkers measured by the number
		of states. We prove that we can generate all sets of Parikh vectors of
		recursively enumerable languages if we restrict the number and size of
		checkers to one checker with six states or to five checkers with two states.
		Moreover, we prove that Darwinian systems with one membrane and checkers
		with at most two states are also sufficient to generate all Parikh sets
		of recursively enumerable languages. The latter result is optimal since
		Darwinian systems with checkers with only one state generate only sets
		of Parikh vectors of ET0L languages. All results are valid for length sets
		instead of sets of Parikh vectors, too.}
}

@inproceedings{Subramanian:Array,
	author={K.G. Subramanian and M. Geethalakshmi and P. Helen Chandra},
	title={Array rewriting P systems generating rectangular arrays},
	booktitle={National Conference in Intelligent Optimization Modeling Gandhigram Rural
		Institute-Deemed University, India},
	year={2006},
	month={March},
	address={India}
}

@inproceedings{Subramanian:Array_P_systems:2006,
	author={K.G. Subramanian and R. Saravanan and K. Rangarajan},
	title={Array P systems and basic puzzle grammars},
	booktitle={National Conference in Intelligent Optimization Modeling Gandhigram Rural
		Institute-Deemed University, India},
	year={2006},
	month={March},
	address={India}
}

@inproceedings{Subramanian:P,
	author={K.G. Subramanian and R. Saravanan and M. Geethalakshmi and P. Helen Chandra
		and M. Margenstern},
	title={P systems with array objects and array rewriting rules},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={160--167}
}

@inproceedings{Subramanian:P_systems_with:BIC-TA:2006,
	author={K.G. Subramanian and R. Saravanan and M. Geethalakshmi and P. Helen Chandra
		and M. Margenstern},
	title={P systems with array objects and array rewriting rules},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Bianco:Towards_a_P_Systems:WMC7:2006,
	author={L. Bianco and D. Pescini and P. Siepmann and N. Krasnogor and F.J. Romero-Campero
		and M. Gheorghe},
	title={Towards a P Systems Pseudomonas Quorum Sensing Model},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={159-176}
}

@inproceedings{Bianco:Towards_an_Hybrid:WMC7:2006,
	author={L. Bianco and F. Fontana},
	title={Towards an Hybrid Metablic Algorithm},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={145-158}
}

@inproceedings{Fernandez:Massively_Parallel_Algorithm:WMC7:2006,
	author={L. Fernandez and F. Arroyo and J.A. Tejedor and J. Castellanos},
	title={Massively Parallel Algorithm for Evolution Rules Application in Transition
		P Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={337-343}
}

@inproceedings{Huang:P_systems_based:BIC-TA:2006,
	author={L. Huang and N. Wang},
	title={P systems based multi-objective optimization algorithm},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Huang:Simulation,
	author={L. Huang and N. Wang},
	title={An optimization algorithms inspired by membrane computing},
	booktitle={Proceedings ICNC},
	year={2006},
	publisher={Springer},
	editor={L. Jiao},
	pages={49--55},
	series={Lecture Notes In Computer Science},
	volume={4222}
}

@inproceedings{Huang:P,
	author={L. Huang and X.-X. He and N. Wang and Y. Xie},
	title={P systems based multi-objective optimization algorithm},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={113--123}
}

@inproceedings{Leporati:A_Membrane_Algorithm:WMC7:2006,
	author={Leporati and D. Pagani},
	title={A Membrane Algorithm for the Min Storage Problem},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={397-416}
}

@inproceedings{Camara:A_Cell_Cell_Signaling:WMC7:2006,
	author={M. Camara and Quorum Sensing},
	title={A Cell-Cell Signaling Mechanism Used to Coordinate Behavioural Changes in
		Bacterial Populations},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={10-14}
}

@inproceedings{Cardona:Classifying_States_of:WMC7:2006,
	author={M. Cardona and M.A. Colomer and M.J. Perez-Jimenez and A. Zaragoza},
	title={Classifying States of a Finite Markov Chain with Membrane Computing},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={229-241}
}

@inproceedings{Cavaliere:Membrane,
	author={M. Cavaliere and A. Riscos-Nunez and R. Brijder and G. Rozenberg},
	title={Membrane systems with marked membranes},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Cavaliere:Playing_with_Partial:WMC7:2006,
	author={M. Cavaliere and R. Mardare},
	title={Playing with Partial Knowledge in Membrane Systems: A Logical Approach},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={242-260}
}

@inproceedings{Cavaliere:with,
	author={M. Cavaliere and S. Sedwards},
	title={Membrane systems with peripheral proteins: transport and evolution},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Gheorghe:P,
	author={M. Gheorghe},
	title={P systems - A new computational approach in systems biology},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={7--14}
}

@inproceedings{Ionescu:Computing_with_spiking:DNA12:2006,
	author={M. Ionescu and A. Paun and Gh. Paun and M.J. Perez-Jimenez},
	title={Computing with spiking neural P systems: Traces and small universal systems},
	booktitle={Proceedings DNA12},
	year={2006},
	month={June},
	address={Seul},
	editor={C. Mao and Y. Yokomori and B.-T. Zhang},
	pages={32--42}
}

@inproceedings{Gutierrez-Naranjo:A_membrane:BIC-TA:2006,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez and A. Riscos-Nunez and F.J.
                  Romero-Campero},
  title        = {A membrane computing view on tumours},
  booktitle    = {Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006
                  Wuhan, China, September 2006, Membrane Computing Section.},
  year         = {2006},
}

@inproceedings{Gutierrez-Naranjo:A,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez and A. Riscos-Nunez and F.J.
                  Romero-Campero},
  title        = {A membrane computing view on tumours},
  booktitle    = {Pre-proceedings of International Conference on Bio-Inspired Computing -
                  Theory and Applications, BIC-TA 2006, Membrane Computing Section},
  year         = {2006},
  month        = {September},
  address      = {Wuhan, China},
  pages        = {103--112},
}

@inproceedings{Gutierrez-Naranjo:On,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. Perez-Jimenez and A. Riscos-Nunez and F.J.
                  Romero-Campero},
  title        = {On the efficiency of cell-like and tissue-like recognizer membrane systems},
  booktitle    = {Proceedings of NICSO},
  year         = {2006},
}

@inproceedings{Perez-Jimenez:Modelling_of_Cellular_Signalling:WMC7:2006,
	author={M.J. Perez-Jimenez},
	title={P systems-based Modelling of Cellular Signalling Pathways},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={54-73}
}

@inproceedings{Perez-Jimenez:Modelling_Cellular_Signalling:WMC7:2006,
	author={M.J. Perez-Jimenez},
	title={P systems-based Modelling of Cellular Signalling Pathways},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={54-73}
}

@inproceedings{Perez-Jimenez:Modelling_of_Cellular_Signalling:WMC,
	author={M.J. Perez-Jimenez},
	title={P systems-based Modelling of Cellular Signalling Pathways},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={54-73}
}

@inproceedings{Oswald:Independent_agents:CALR:2006,
	author={Marion Oswald},
	title={Independent agents in a globalized world modelled by tissue P systems},
	booktitle={Conf. Artificial Life and Robotics},
	year={2006}
}

@inproceedings{Cavaliere:Time_Driven:4BWMC:2006,
	author={Matteo Cavaliere and Claudio Zandron},
	title={Time-Driven Computations in {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={133--144},
	abstract={It is a well-known fact that the time of execution of a (biochemical) reaction
		depends on many factors, and, in particular, on the current situation of
		the whole system. With this motivation in mind, we propose a model of computation
		based on membrane systems where the various rewriting rules have different
		times of execution and, moreover, the time of execution of each rule can
		vary during the computation, depending on the configuration of the whole
		system (in this sense, the computation is "time-driven"). We show that
		such systems are universal in a very simple framework: a regular time-mapping
		succes to obtain universality for systems with minimal cooperation (one
		catalyst).}
}

@inproceedings{Cavaliere:Multiset_Random:4BWMC:2006,
	author={Matteo Cavaliere and Rudolf Freund and Marion Oswald and Dragos Sburlan},
	title={Multiset Random Context Grammars, Checkers, and Transducers},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={113--132},
	abstract={We introduce a general model of random context multiset grammars as well
		as the concept of multiset random context checkers and transducers. Our
		main results show how recursively enumerable sets of finite multisets can
		be generated using these models of computing; corresponding results for
		antiport P systems are established, too.}
}

@inproceedings{Muskulus:Reaction_Cycles:4BWMC:2006,
	author={Michael Muskulus and Sanne Houweling and Grzegorz Rozenberg and Daniela Besozzi and,
		Paolo Cazzaniga and Dario Pescini and Robert Brijder},
	title={Reaction Cycles in Membrane Systems and Molecular Dynamics},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={185--208},
	abstract={We are considering molecular dynamics and (sequential) membrane systems
		from the viewpoint of Markov chain theory. The first step is to understand
		the structure of the configuration space, with respect to communicating
		classes. Instead of a reachability analysis by traditional methods, we
		use the explicit monoidal structure of this space with respect to rule
		applications. This leads to the notion of precycle, which is an element
		of the integer kernel of the stoichiometric matrix. The generators of the
		set of precycles can be effectively computed by an incremental algorithm
		due to Contejean and Devie. To arrive at a characterization of cycles,
		we introduce the notion of defect, which is a set of geometric constraints
		on a configuration to allow a precycle to be enabled, that is, be a cycle.
		An important open problem is the efficient calculation of the defects.
		We also discuss aspects of asymptotic behavior and connectivity, as well
		as give a biological example, showing the usefulness of the method for
		model checking.}
}

@inproceedings{Gutierrez_Naranjo:Fractals:4BWMC:2006,
	author={Miguel-Angel Guti{\'e}rrez-Naranjo and Mario-Jes{\'u}s P{\'e}rez-Jim{\'e}nez},
	title={Fractals and {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={65--86},
	abstract={In this paper we show that the massive parallelism, the synchronous application
		of the rules, and the discrete nature of their computation, among other
		features, lead us to consider P systems as natural tools for dealing with
		fractals. Several examples of fractals encoded by P systems are presented
		and we wonder about using P systems as a new tool for representing and
		simulating the fractal nature of tumors.}
}

@inproceedings{Gutierrez_Naranjo:An_Approach:4BWMC:2006,
	author={Miguel-Angel Guti{\'e}rrez-Naranjo and Mario-Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-N{\'u}{\~n}ez},
	title={An Approach to the Degree of Parallelism in {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={87--104},
	abstract={In the literature, several designs of P systems were used for performing
		the same task. The use of different techniques or even different P system
		models makes it very dificult to compare these designs. In this paper,
		we introduce a new criterion for such a comparison: the degree of parallelism
		of a P system. To this aim, we define the labeled dependency graph associated
		with a P system, and we use this new concept for proving some results concerning
		the maximum number of applications of rules in a single step along the
		computation of a P system.}
}

@inproceedings{Cardona:Handling_Markov_Chains:4BWMC:2006,
	author={M{\'o}nica Cardona and M.Angels Colomer and Mario-Jes{\'u}s P{\'e}rez-Jim{\'e}nez and Alba
		Zaragoza},
	title={Handling Markov Chains with Membrane Computing},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={99--112},
	abstract={In this paper we approach the problem of computing the n�th power of the
		transition matrix of an arbitrary Markov chain through membrane computing.
		The proposed solution is described in a semi�uniform way in the framework
		of P systems with external output. The amount of resources required in
		the construction is polynomial in the number of states of the Markov chain
		and in the power. The time of execution is linear in the power and is independent
		of the number of states involved in the Markov chain.}
}

@inproceedings{Busi:Computing_with_Genetic_Gates:WMC7:2006,
	author={N. Busi and C. Zandron},
	title={Computing with Genetic Gates, Proteins and Membranes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={213-228}
}

@inproceedings{Busi:Modeling:WSC:2006,
	author={N. Busi and C. Zandron},
	title={Modeling and Analysis of Biological Processes by Mem(Brane) Calculi and
		Systems},
	booktitle={Proc. of the 2006 Winter Simulation Conference, Monterey, CA, Usa},
	year={2006}
}

@inproceedings{Busi:A_Case_Study:WMC7:2006,
  author       = {N. Busi and M.A. Guti{\'e}rrez-Naranjo},
  title        = {A Case Study in (Mem)Brane Computation: Generating $\{ n^2 \mid n\geq 1 \}$ },
  booktitle    = {Pre-proceedings of Membrane Computing, International Workshop, WMC7},
  year         = {2006},
  address      = {Leiden, The Netherlands},
  editor       = {H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
  pages        = {196-212},
}

@inproceedings{Busi:Decidability:4BWMC:2006,
	author={Nadia Busi},
	title={Decidability of Divergence for Catalytic {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={63--80},
	abstract={P systems are a biologically inspired model introduced by Gheorghe Paun
		with the aim of representing the structure and the functioning of the cell.
		Since their introduction, several variants of P systems have been proposed
		and explored. We concentrate on the class of catalytic P systems without
		priorities associated to the rules. We show that the divergence problem
		(i.e., checking for the existence of an infinite computation) is decidable
		in such a class of P systems. As a corollary, we obtain an alternative
		proof of the nonuniversality of deterministic catalytic P systems, an open
		problem recently solved by Ibarra and Yen.}
}

@inproceedings{Busi:A_Case_Study:4BWMC:2006,
	author={Nadia Busi and Miguel-Aangel Guti{\'e}rrez-Naranjo},
	title={A Case Study in (Mem)Brane Computation: Generating $\{ n^2 \mid n \geq 1 \}$ },
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={81--98},
	abstract={The aim of this paper is to start an investigation and a comparison of the
		expressiveness of the two most relevant formalisms inspired by membranes
		interactions, namely, P systems and Brane Calculi. We compare the two formalisms
		w.r.t. their ability to act as language generators. In particular, we show
		different ways of generating the set L = {n2 | n >= 1} in P systems and
		in Brane Calculi.}
}

@inproceedings{Andrei:Strategies:BWMC4:2006,
	author={O. Andrei and G. Ciobanu and D. Lucanu},
	title={Strategies in membrane computing},
	booktitle={BWMC4},
	year={2006},
	address={Sevilla}
}

@inproceedings{Andrei:Expressing_Control_Mechanisms:WMC7:2006,
	author={O. Andrei and G. Ciobanu and D. Lucanu},
	title={Expressing Control Mechanisms in P Systems by Rewriting Strategies},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={119-131}
}

@inproceedings{Ibarra:Characterizations_of_Some_Restricted:WMC7:2,
	author={O.H. Ibarra and S. Woodworth},
	title={Characterizations of Some Restricted Spiking Neural P Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={387-396}
}

@inproceedings{Ibarra:Characterizations_of_Some_Restricted:WMC7:2006,
	author={O.H. Ibarra and S. Woodworth},
	title={Characterizations of Some Restricted Spiking Neural P Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={387-396}
}

@inproceedings{Ibarra:Normal_Forms:4BWMC:2006,
	author={Oscar-H. Ibarra and Andrei Paun and Gheorghe Paun and Alfonso Rodr{\'i}guez-Pat{\'o}n and Petr Sosik and Sara Woodworth},
	title={Normal Forms for Spiking Neural {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={105--136},
	abstract={The spiking neural P systems are a class of computing devices recently introduced
		as a bridge between spiking neural nets and membrane computing. In this
		paper we prove a series of normal forms for spiking neural P systems, concerning
		the regular expressions used in the firing rules, the delay between firing
		and spiking, the forgetting rules used, and the outdegree of the graph
		of synapses. In all cases, surprising simplifications are found, without
		losing the computational universality � sometimes at the price of (slightly)
		increasing other parameters which describe the complexity of these systems.}
}

@inproceedings{Cazzaniga:Tau_Leaping_Stochastic:WMC7:2006,
	author={P. Cazzaniga and D. Pescini and D. Besozzi and G. Mauri},
	title={Tau Leaping Stochastic Simulation Method in P Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={261-273}
}

@inproceedings{Frisco:Infinite_Hierarchies:WMC7:2006,
	author={P. Frisco},
	title={Infinite Hierarchies of Conformon-P Systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={357-371}
}

@inproceedings{Frisco:Dynamics,
	author={P. Frisco and D. W. Corne},
	title={Dynamics of HIV infection studied with Conformon-P systems},
	booktitle={The Seventh International Conference on Systems Biology, October 9-13, 2006,
		Yokohama, Japan},
	year={2006},
	month={october 9--13},
	address={Yokohama, Japan}
}

@inproceedings{Cazzaniga:Stochastic:4BWMC:2006,
	author={Paolo Cazzaniga and Dario Pescini and Francisco-Jos{\'e} Romero-Campero and
		Daniela Besozzi and Giancarlo Mauri},
	title={Stochastic Approaches in {P} Systems for Simulating Biological Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={145--164},
	abstract={Different stochastic strategies for modeling biological systems with P systems
		are reviewed in this paper, such as the multi-compartmental approach and
		dynamical probabilistic P systems. The respective results obtained from
		the simulations of a test case study (the quorum sensing phenomena in Vibrio
		Fischeri colonies) are shown, compared and discussed.}
}

@inproceedings{Brijder:Systems:with_External_Control:WMC7:2006,
	author={R. Brijder and M. Cavaliere and A. Riscos-Nunez and G. Rozenberg and D.
		Sburlan},
	title={Membrane Systems with External Control},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={177-195}
}

@book{Freund:LNCS3850:2006,
  author       = {R. Freund and Gh. Paun and G. Rozenberg and A. Salomaa},
  title        = {Membrane Computing},
  booktitle    = {International Workshop, WMC6, Vienna, Austria, 2005, Selected and Invited
                  Papers},
  year         = {2006},
  publisher    = {Springer-Verlag},
  series       = {LNCS 3850},
}

@inproceedings{Freund:Tissue,
	author={R. Freund and M. Oswald},
	title={Tissue P systems with mate and drip operations},
	booktitle={Proceedings MeCBIC 2006},
	year={2006},
	address={Venice},
	editor={N. Busi and C. Zandron}
}

@inproceedings{Freund:How_a_membrane:BIC-TA:2006,
	author={R. Freund and M. Oswald and T. Schirk},
	title={How a membrane agent buys goods in a membrane store},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Freund:How,
	author={R. Freund and M. Oswald and T. Schirk},
	title={How a membrane agent buys goods in a membrane store},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={93--102}
}

@inproceedings{Ceterchi:Rewriting:4BWMC:2006,
	author={Rodica Ceterchi},
	title={Rewriting in {P} Systems: An Algebreic Approach},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume I},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={165--168},
	abstract={We reformulate in algebraic terms the maximal parallel rewriting of symbols
		which occur inside membranes of a P system.}
}

@inproceedings{Freund:Particular_Results:4BWMC:2006,
	author={Rudolf Freund},
	title={Particular Results for Variants of {P} Systems with One Catalyst in One
		Membrane},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={41--50},
	abstract={Purely catalytic P systems can generate all recursively enumerable sets
		of natural numbers with only three catalysts in one membrane, whereas we
		know that one catalyst in one membrane is not enough. On the other hand,
		P systems also allowing (non-catalytic) non-cooperative evolution rules
		with only two catalysts in one membrane are already computationally complete,
		too. We here investigate special variants of P systems with only one catalyst
		in one membrane that are not computationally complete, i.e., variants of
		P systems with only one catalyst in one membrane that cannot generate all
		recursively enumerable sets of natural numbers.}
}

@inproceedings{Freund:Small_Universal:4BWMC:2006,
	author={Rudolf Freund and Marion Oswald},
	title={Small Universal Antiport {P} Systems and Universal Multiset Grammars},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={51--64},
	abstract={Based on the construction of a universal register machine (see [7]) we construct
		a universal antiport P system working with 31 rules in the maximally parallel
		mode in one membrane, and a universal antiport P system with forbidden
		context working with 16 rules in the sequential derivation mode in one
		membrane for computing any partial recursive function on the set of natural
		numbers. For accepting/generating any arbitrary recursively enumerable
		set of natural numbers we need 31/33 and 16/18 rules, respectively. As
		a consequence of the result for antiport P systems with forbidden context
		we immediately infer similar results for forbidden random context multiset
		grammars with arbitrary rules.}
}

@inproceedings{Cheruku:Simulating,
	author={S. Cheruku and A. Paun and F.J. Romero-Campero and M.J. Perez-Jimenez and
		O.H. Ibarra},
	title={Simulating FAS-induced apoptosis by using P systems},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={71--81}
}

@inproceedings{Cheruku:Simulating_FAS-induced:BIC-TA:2006,
	author={S. Cheruku and A. Paun and F.J. Romero-Campero and M.J. Perez-Jimenez and
		O.H. Ibarra},
	title={Simulating FAS-induced apoptosis by using P systems},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Verlan:On,
	author={S. Verlan and F. Bernardini and M. Gheorghe and M. Margenstern},
	title={On Communication in Tissue P Systems: Conditional Uniport},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={507-521}
}

@inproceedings{Krishna:Combining,
	author={S.N. Krishna},
	title={Combining brane calculus and membrane computing},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={131--143}
}

@inproceedings{Krishna:Combining_brane:BIC-TA:2006,
	author={S.N. Krishna},
	title={Combining brane calculus and membrane computing},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Hinze:A_Protein_Substructure:WMC7:2006,
	author={T. Hinze and T. Lenser and P. Dittrich},
	title={A Protein Substructure Based P System for Description and Analysis of Cell
		Signalling Networks},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={372-286}
}

@inproceedings{Manca:Metabolic,
	author={V. Manca},
	title={Metabolic P systems for biomolecular dynamics},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={15--26}
}

@inproceedings{Manca:MP_Systems:WMC7:2006,
	author={V. Manca},
	title={MP Systems Approaches to Biochemical Dynamics: Biological Rhythms and Oscillations},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={40-53}
}

@inproceedings{Manca:Topics_and_Problems:4BWMC:2006,
	author={Vicenzo Manca},
	title={Topics and Problems in Metabolic {P} Systems},
	booktitle={Fourth Brainstorming Week on Membrane Computing, Sevilla, January 30 - February
		3, 2006. Volume II},
	year={2006},
	publisher={F{\'e}nix Editora},
	editor={Miguel Angel Guti{\'e}rrez-Naranjo and Gheorghe Paun and Agust{\'i}n Riscos-N{\'u}{\~n}ez
		and Francisco Jos{\'e} Romero-Campero},
	pages={173--184},
	abstract={P metabolic systems are a special class of P systems which seem to be adequate
		for expressing biological phenomena related to metabolism and signaling
		transduction in biological systems. We give the basic motivation for their
		introduction and some ideas about their applicability and development.}
}

@inproceedings{Korczynski:Paun_systems:BIC-TA:2006,
	author={W. Korczynski},
	title={Paun's systems as models of economic systems},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Korczynski:Paun:2006,
	author={W. Korczynski},
	title={Paun's systems as models of economic systems},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={124--130}
}

@inproceedings{Xu:Tissue,
	author={Xian Xu},
	title={Tissue P systems with parallel rules on channels},
	booktitle={Pre-proceedings of International Conference on Bio-Inspired Computing -
		Theory and Applications, BIC-TA 2006, Membrane Computing Section},
	year={2006},
	month={September},
	address={Wuhan, China},
	pages={168--177}
}

@inproceedings{Xu:Tissue_P_systems:BIC-TA:2006,
	author={Xian Xu},
	title={Tissue P systems with parallel rules on channels},
	booktitle={Proc. Bio-Inspired Computing -- Theory and Applications Conf., BIC-TA 2006,
		Wuhan, China, September 2006, Membrane Computing Section.},
	year={2006}
}

@inproceedings{Pu:Simulation_of_biomolecular:WHPCLF:2006,
	author={Y. Pu and Y. Yu and X. Dong},
	title={Simulation of biomolecular processes by using stochastic P systems},
	booktitle={Workshop on High Performance Computing in the Life Sciences},
	year={2006},
	month={October},
	address={Ouro Preto, Brasil}
}

@inproceedings{Suzuki:An,
	author={Y. Suzuki},
	title={An Attempt to Analyze the Dynamics of Abstract Rewriting Systems on Multisets},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop, WMC7},
	year={2006},
	address={Leiden, The Netherlands},
	editor={H.J. Hoogeboom and Gh. Paun and G. Rozenberg},
	pages={501-506}
}

@inproceedings{Alhazov:Partial:5BWMC:2007,
  author       = {A. Alhazov and R. Freund and M. Oswald and S. Verlan},
  title        = {Partial Versus Total Halting in P Systems},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. Paun and A. Romero-Jimenez and A. Riscos-Nunez},
  pages        = {1--20},
}

@inproceedings{Alhazov:Skin,
	author={A. Alhazov and Y. Rogozhin},
	title={Skin output in {P} systems with minimal symport/antiport and two membranes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={99--110}
}

@inproceedings{Binder:Extended:5BWMC:2007,
  author       = {A. Binder and R. Freund and M. Oswald and L. Vock},
  title        = {Extended Spiking Neural P systems with Excitatory and Inhibitory Astrocytes},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}aun and A. Romero-Jimenez and A. Riscos-Nunez},
  pages        = {63--72},
}

@inproceedings{Gutierrez:Optimizing_membrane_system:PreWMC8:2007,
  author       = {A. Guti{\'e}rrez and L. Fernandez and F. Arroyo and G. Bravo},
  title        = {Optimizing membrane system implementation with multisets and evolution rules
                  compression},
  booktitle    = {Pre-proceedings of Membrane Computing, International Workshop - WMC8},
  year         = {2007},
  address      = {Thessaloniki, Greece},
  editor       = {G. Eleftherakis and P. Kefalas, Gh. P{\u a}un},
  pages        = {345--362},
}

@inproceedings{Leporati:UREM:PreWMC8:2007,
	author={A. Leporati},
	title={Quantum ({UREM}) {P} systems: Background, definition and computational power},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={33--56}
}

@inproceedings{Leporati:Computational_Power:5BWMC:2007,
  author       = {A. Leporati and C. Zandron and C. Ferretti and G. Mauri},
  title        = {On the Computational Power of Spiking Neural P Systems},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. Riscos-Nunez},
  pages        = {227--246},
}

@inproceedings{Leporati:Solving_numerical_NP:PreWMC8:2007,
	author={A. Leporati and C. Zandron and C. Ferretti and G. Mauri},
	title={Solving numerical {NP}-complete problems with spiking neural {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={405--424}
}

@inproceedings{Obtulowicz:Mathematical_Methods:5BWMC:2007,
  author       = {A. Obtulowicz},
  title        = {Some Mathematical Methods and Tools for an Analysis of Harmony-Seeking Computations},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. Riscos-N{\'u}{\~n}ez},
  pages        = {246--262},
}

@inproceedings{Obtulowicz:Multigraphical_membrane:PreWMC8:2007,
	author={A. Obtulowicz},
	title={Multigraphical membrane systems: a visual formalism for modeling complex
		systems in biology and evolving neural networks},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={509--512}
}

@inproceedings{Paun:On_flip_flop:PreWMC8:2007,
	author={A. Paun and A. Rodriguez-Paton},
	title={On flip-flop membrane systems with proteins},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={513--526}
}

@inproceedings{Tejedor:An_architecture_for:SALR:2007,
	author={A. Tejedor and L. Fernandez and F. Arroyo and G. Bravo},
	title={An architecture for attacking the bottleneck communication in {P} systems},
	booktitle={Proceedings of the 12th Int. Symposium on Artificial Life and Robotics},
	year={2007},
	month={Jan 25-27},
	address={Beppu, Oita, Japan},
	editor={M. Sugisaka and H. Tanaka},
	pages={500-505}
}

@inproceedings{Aman:reachability,
	author={B. Aman and G. Ciobanu},
	title={On the reachability problem in {P} systems with mobile membranes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={111--123}
}

@inproceedings{Bonchis:Information:5BWMC:2007,
  author       = {C. Bonchis and C. Izbasa and G. Ciobanu},
  title        = {Information Theory over Multisets},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. Riscos-N{\'u}{\~n}ez},
  pages        = {73--86},
}

@inproceedings{Bonchis:Information,
	author={C. Bonchis and C. Izbasa and G. Ciobanu},
	title={Information theory over multisets},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={165--172}
}

@inproceedings{Graciani-Diaz:Model_for_Ballistic:5BWMC:2007,
  author       = {C. Graciani-Diaz and M.A. Guti{\'e}rrez-Naranjo and M.J. P{\'e}rez-Jim{\'e}nez},
  title        = {A Membrane Computing Model for Ballistic Depositions},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. Riscos-N{\'u}{\~n}ez},
  pages        = {179--198},
}

@inproceedings{Diaz-Pernil:cellular_solution:PreWMC8:2007,
  author       = {D. Diaz-Pernil and M.A. Guti{\'e}rrez-Naranjo and M.J. P{\'e}rez-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  title        = {A cellular solution to subset sum using division of non-elementary membranes and dissolution, with time and initial resources bounded by log $k$},
  booktitle    = {Pre-proceedings of Membrane Computing, International Workshop - WMC8},
  year         = {2007},
  address      = {Thessaloniki, Greece},
  editor       = {G. Eleftherakis and P. Kefalas, Gh. P{\u a}un},
  pages        = {301--316},
}

@inproceedings{Diaz-Pernil:Subset_Sum:5BWMC:2007,
  author       = {D. Diaz-Pernil and M.A. Guti{\'e}rrez-Naranjo and M.J. P{\'e}rez-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  title        = {Subset Sum with Tissue P Systems with Cell Division},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {113--130},
}

@inproceedings{Molteni:Frequency_MS:PreWMC8:2007,
	author={D. Molteni and C. Ferretti and G. Mauri},
	title={Frequency membrane systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={445--454}
}

@inproceedings{Ramirez:Software_Tool:5BWMC:2007,
  author       = {D. Ramirez-Martinez and M.A. Guti{\'e}rrez-Naranjo},
  title        = {A Software Tool for Dealing with Spiking Neural P Systems},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {299--314},
}

@inproceedings{Csuhaj:P_systems_with_string_objects:PreWMC8:2007,
	author={E. Csuhaj-Varju and G. Vaszil},
	title={{P} systems with string objects and with communication by request},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={267--278}
}

@inproceedings{Bernardini:A,
	author={F. Bernardini and M. Gheorghe and F.J. Romero-Campero and N. Walkinshaw},
	title={A hybrid approach to modelling biological systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={139--164}
}

@inproceedings{Bernardini:Networks:5BWMC:2007,
  author       = {F. Bernardini and M. Gheorghe and M. Margenstern and S. Verlan},
  title        = {Networks of Cells and Petri Nets},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {33--62},
}

@inproceedings{Ciobanu:What_is_an_event:PreWMC8:2007,
	author={G. Ciobanu and D. Lucanu},
	title={What is an event for membrane systems?},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={255--266}
}

@inproceedings{Ciobanu:Networks_of_Mealy:PreWMC8:2007,
	author={G. Ciobanu and M. Gontineac},
	title={Networks of Mealy multiset automata},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={243-- 254}
}

@inproceedings{Delzanno:dynamics_of_PB:PreWMC8:2007,
	author={G. Delzanno and L. Van Begin},
	title={On the dynamics of {PB} systems with volatile membranes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={279--300}
}

@inproceedings{Paun:Twenty_Six:5BWMC:2007,
  author       = {Gh. Paun},
  title        = {Twenty Six Research Topics About Spiking Neural P Systems},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {363--280},
}

@inproceedings{Stefan:MC_in_Connex:PreWMC8:2007,
	author={Gh. Stefan},
	title={Membrane computing in Connex environment},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={81--98}
}

@inproceedings{Ramesh:Rewriting_P_systems:PreWMC8:2007,
	author={H. Ramesh and R. Rama},
	title={Rewriting {P} systems with conditional communication: improved hierarchies},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={527--538}
}

@inproceedings{Stamatopoulou:OPERAS:PreWMC8:2007,
	author={I. Stamatopoulou and P. Kefalas and M. Gheorghe},
	title={OPERAS$_{CC}$: An instance of a formal framework for {MAS} modelling based
		on population {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={551--566}
}

@inproceedings{Ardelean:Magnetotactic:5BWMC:2007,
  author       = {I.I. Ardelean and M. Ignat and C. Moisescu},
  title        = {Magnetotactic Bacteria and Their Significance for P Systems and Nanoactuators},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {21--32},
}

@inproceedings{Kelemen:Plain_talk_about:PreWMC8:2007,
	author={J. Kelemen},
	title={Plain talk about language-theoretic models of multi-agent systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={395--404}
}

@inproceedings{Tejedor:Algorithm_of_rules:PreWMC8:2007,
	author={J.A. Tejedor and L. Fernandez and F. Arroyo and S. Gomez},
	title={Algorithm of rules applications based on competitiveness of evolution rules},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={567--580}
}

@inproceedings{Sempere:Characterizing_membrane:PreWMC8:2007,
	author={J.M. Sempere and D. Lopez},
	title={Characterizing membrane structures through multiset tree automata},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={539--550}
}

@inproceedings{Sempere:Tree_Automata:5BWMC:2007,
  author       = {J.M. Sempere and D. Lopez},
  title        = {On Two Families of Multiset Tree Automata},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {315--325},
}

@inproceedings{Subramanian:image_generation:ICSP:2007,
	author={K.G. Subramanian and S. Hemalatha and C. Sri Hari Nagore},
	title={On image generation by sequential/parallel rewriting P systems},
	booktitle={Proc. Intern. Conf. on Signal Processing, Communications and Networking,
		Anna University, Chennai, IEEE - IETE},
	year={2007},
	pages={70--73}
}

@inproceedings{Bernardinello:Modeling,
	author={L. Bernardinello and N. Bonzanni and M. Mascheroni and L. Pomello},
	title={Modeling symport/antiport {P} systems with a class of hierarchical Petri
		nets},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={123--138}
}

@inproceedings{Bianco:Psim:PreWMC8:2007,
	author={L. Bianco},
	title={Psim: A computational platform for metabolic {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={1--20}
}

@inproceedings{Cienciala:number_of_agents:PreWMC8:2007,
	author={L. Cienciala and L. Ciencialova and A. Kelemenova},
	title={On the number of agents in {P} colonies},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={227--242}
}

@inproceedings{Ciencialova:Variations_on:WFM06:2007,
	author={L. Ciencialova and L. Cienciala},
	title={Variations on the theme: {P} colonies},
	booktitle={Proc. First Intern. Workshop WFM06},
	year={2007},
	address={Ostrava},
	editor={D. Kol and A. Meduna},
	pages={27--34}
}

@inproceedings{Fernandez:Parallel_software:SALR:2007,
	author={L. Fernandez and F. Arroyo and I. Garcia and A. Gutierrez},
	title={Parallel software architectures analysis for implementing {P} systems},
	booktitle={Proceedings of the 12th Int. Symposium on Artificial Life and Robotics},
	year={2007},
	month={Jan 25-27},
	address={Beppu, Oita, Japan},
	editor={M. Sugisaka and H. Tanaka},
	pages={494-499}
}

@inproceedings{Cardona:Hierarchical,
	author={M. Cardona and M.A. Colomer and M.J. Perez-Jimenez and A. Zaragoza},
	title={Hierarchical clustering with membrane computing},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={185--204}
}

@inproceedings{Garcia-Arnau:Spiking:5BWMC:2007,
  author       = {M. Garcia-Arnau and D. Perez and A. Rodriguez-Paton and P. Sosik},
  title        = {Spiking Neural P Systems: Stronger Normal Forms},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {157--178},
}

@inproceedings{Ionescu:Adjoining_Controlled:5BWMC:2007,
  author       = {M. Ionescu and D. Sburlan},
  title        = {P Systems with Adjoining Controlled Communication Rules},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {199--212},
}

@inproceedings{Ionescu:Some_applications_of:PreWMC8:2007,
	author={M. Ionescu and D. Sburlan},
	title={Some applications of spiking neural {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={383--394}
}

@inproceedings{Ionescu:Applications_of:5BWMC:2007,
  author       = {M. Ionescu and D. Sburlan},
  title        = {Several Applications of Spiking Neural P Systems},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {213--226},
}

@inproceedings{Umeki:Direct_simulation_of:PreWMC8:2007,
	author={M. Umeki and Y. Suzuki},
	title={Direct simulation of the Oregonator model by using a class of {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={581--588}
}

@inproceedings{Perez-Jimenez:Schema_Based_on:5BWMC:2007,
  author       = {M.J. P{\'e}rez-Jim{\'e}nez and T. Yokomori},
  title        = {Membrane Computing Schema Based on String Insertions},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {281-- 298},
}

@inproceedings{Busi:Causality,
	author={N. Busi},
	title={Causality in membrane systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={173--184}
}

@inproceedings{Busi:Causal,
  author       = {N. Busi},
  title        = {Towards a Causal Semantics for Brane Calculi},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {97--112},
}

@inproceedings{Murphy:Active_membrane:PreWMC8:2007,
	author={N. Murphy and D. Woods},
	title={Active membrane systems without charges and using only symmetric elementary
		division characterize {P}},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={455--470}
}

@inproceedings{Frisco:Conformon-P_systems:PreWMC8:2007,
	author={P. Frisco},
	title={Conformon-P systems with negative values},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis, P. Kefalas, Gh. Paun},
	pages={331-344}
}

@inproceedings{Frisco:Advances,
	author={P. Frisco and D.W. Corne},
	title={Advances in modeling the dynamics of HIV infection with conformon-{P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={21--32}
}

@inproceedings{Barbuti:The,
	author={R. Barbuti and A. Maggiolo-Schettini and P. Milazzo and A. Troina},
	title={The calculus of looping sequences for modeling biological membranes},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={57--80}
}

@inproceedings{Borrego:VisualTissue:5BWMC:2007,
  author       = {R. Borrego-Ropero and D. Diaz-Pernil and J.A. Nepomuceno},
  title        = {VisualTissue: A Friendly Tool to Study Tissue P Systems Solutions for Graph
                  Problems},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {87--96},
}

@inproceedings{Ceterchi:Simulating,
	author={R. Ceterchi and M.J. Perez-Jimenez and A.I. Tomescu},
	title={Simulating the bitonic sort on a {2D}-mesh with {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={205--226}
}

@inproceedings{Freund:Polarizationless:5BWMC:2007,
  author       = {R. Freund and Gh. P{\u a}un and M.J. P{\'e}rez-Jim{\'e}nez },
  title        = {Polarizationless P Systems with Active Membranes Working in the Minimally
                  Parallel Manner},
  booktitle    = {Proceedings of the Fifth Brainstorming Week on Membrane Computing},
  year         = {2007},
  month        = {January 29th - February 2},
  address      = {Sevilla (Spain)},
  editor       = {M.A. Guti{\'e}rrez-Naranjo and Gh. P{\u a}un and A. Romero-Jim{\'e}nez and A. N{\'u}{\~n}ez},
  pages        = {131--156},
}

@inproceedings{Freund:Spiking_neural:SALR:2007,
	author={R. Freund and M. Oswald},
	title={Spiking neural P systems with inhibitory axons},
	booktitle={Proceedings of the 12th Int. Symposium on Artificial Life and Robotics},
	year={2007},
	month={Jan 25-27},
	address={Beppu, Oita, Japan},
	editor={M. Sugisaka and H. Tanaka},
	pages={509-512}
}

@inproceedings{Freund:formal_framework:PreWMC8:2007,
	author={R. Freund and S. Verlan},
	title={A formal framework for {P} systems},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={317--330}
}

@inproceedings{Hinze:Hill_kinetics_meets_P_systems:PreWMC8:2007,
	author={T. Hinze and S. Hayat and T. Lenser and N. Matsumaru and P. Dittrich},
	title={Hill kinetics meets {P} systems: A case study on gene regulatory networks
		as computing agents in silico and in vivo},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={363--382}
}

@inproceedings{Mazza:SBML_functionalities:PreWMC8:2007,
	author={T. Mazza},
	title={Towards a complete covering of {SBML} functionalities},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={425--444}
}

@inproceedings{Nguyen:Balancing_performance:PreWMC8:2007,
	author={V. Nguyen and D. Kearney and G. Gioiosa},
	title={Balancing performance, flexibility and scalability in a parallel computing
		platform for membrane computing applications},
	booktitle={Pre-proceedings of Membrane Computing, International Workshop - WMC8},
	year={2007},
	address={Thessaloniki, Greece},
	editor={G. Eleftherakis and P. Kefalas, Gh. Paun},
	pages={471--508}
}

@inproceedings{Suzuki:Dynamics_of:SALR:2007,
	author={Y. Suzuki},
	title={Dynamics of an abstract chemical system with few molecules},
	booktitle={Proceedings of the 12th Int. Symposium on Artificial Life and Robotics},
	year={2007},
	month={Jan 25-27},
	address={Beppu, Oita, Japan},
	editor={M. Sugisaka and H. Tanaka},
	pages={506-508}
}

@inbook{Dersanambika:Hexagonal_contextual:2006,
	author={K.S. Dersanambika and K. Krithivasan and H.K. Agarwal and J. Gupta},
	title={Hexagonal contextual array {P} systems},
	publisher={World Scientific},
	address={Singapore},
	booktitle={Formal Models, Languages and Applications},
	editor={K.G. Subramanian, K. Rangarajan, M. Mukund }
}

@inbook{Gutierrez-Naranjo:Characterizing_tractability:2006,
  author       = {M.A. Guti{\'e}rrez-Naranjo and M.J. P{\'e}rez-Jim{\'e}nez and A. Riscos-Nunez and F.J. Romero-Campero and A. Romero-Jim{\'e}nez},
  title        = {Characterizing tractability by cell-like membrane systems},
  publisher    = {World Scientific},
  address      = {Singapore},
  booktitle    = {Formal Models, Languages and Applications},
  editor       = {K.G. Subramanian, K. Rangarajan, M. Mukund },
}

@inbook{Paun:Where_Mathematics:On_Membrane:2000,
	author={Andrei P{\u a}un and Mihaela P{\u a}un},
	title={On Membrane Computing Based on Splicing},
	chapter={36},
	year={2000},
	month={November},
	publisher={Kluwer Academic Publishers, Dordrecht Hardbound},
	pages={409--422},
	address={Dordrecht},
	booktitle={Where Mathematics, Computer Science, Linguistics, and Biology Meet},
	editor={Carlos Mart{\'i}n-Vide and Victor Mitrana }
}

@inbook{Calude:Computing_with:Computing_with:2000,
	author={Cristian S. Calude and Gheorghe P{\u a}un},
	title={Computing with Membranes},
	chapter={3},
	year={2000},
	publisher={Taylor and Francis},
	address={London},
	booktitle={Computing with Cells and Atoms}
}

@inbook{Suzuki:Recent_Topics_in:Investigation_of_an:2000,
	author={Yasuhiro Suzuki and Junji Takabayashi and Hiroshi Tanaka},
	title={Investigation of an Ecological System by Using an Abstract Rewriting System
		on Multisets},
	year={2000},
	month={August},
	publisher={Editura Academiei Romane},
	pages={300--309},
	address={Bucharest},
	booktitle={Recent Topics in Mathematical & Computational Linguistics. Papers in Honor
		of Solomon Marcus on the Occasion of his 75th Birthday},
	editor={Carlos Martin-Vide and Gheorghe P{\u a}un }
}

@inbook{Ito:Words_Semigroups_and:A_characterization_of:01,
	author={Masami Ito and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={A characterization of {Parikh} sets of {ET0L} languages in terms of {P}
		systems},
	year={2001},
	publisher={World Scientific},
	pages={239--254},
	address={Singapore},
	booktitle={Words, Semigroups, and Transductions: Essays in Honour of Gabriel Thierrin,
		on the Occasion of His 80th Birthday},
	editor={Masami Ito and Gheorghe P{\u a}un and Sheng Yu }
}

@inbook{Mauri:Membrane_Systems_for:Emergence_in_Complex:02,
	author={Giancarlo Mauri and Claudio Zandron},
	title={Membrane Systems for Computing},
	year={2002},
	month={July},
	publisher={Kluwer Academic/Plenum Publishers Hardbound},
	pages={213--232},
	address={New York},
	booktitle={Emergence in Complex, Cognitive, Social, and Biological Systems},
	editor={G. Minati and E. Pessa }
}

@inbook{Cienciala:Kognice_a_umely:Zivot_ve_svete:2002,
	author={Ludek Cienciala and Alica Kelemenova},
	title={Zivot ve svete symbolu: pocitani pomoci membran},
	year={2002},
	publisher={Slezska Univ.},
	address={Opava},
	note={in vol "Kognice a umely zivot II"},
	booktitle={Kognice a umely zivot II},
	editor={Jozef Kelemen and V. Kvasnicka }
}

@inbook{Sosik:Kognice_a:Membranove_vypocty:2002,
	author={Petr Sosik and Jiri Matysek},
	title={Membranove vypocty: komunikace versus reakce},
	year={2002},
	publisher={Slezska Univ.},
	pages={233--244},
	address={Opava},
	note={in vol "Kognice a umely zivot II"},
	booktitle={Kognice a umely zivot II},
	editor={Jozef Kelemen and V. Kvasnicka }
}

@inbook{Ramos-Espina:Recursos_precomputados:2004,
	author={Antonio Jesus Ramos-Espina},
	title={Uso de recursos precomputados en sistemas celulares},
	chapter={3},
	year={2004},
	publisher={Fenix Editorial},
	pages={159--241},
	address={Sevilla},
	booktitle={Modelos de Computacion Molecular, Celular y Cuantica},
	editor={Mario Jes{\'u}s Perez-Jimenez and Agust{\'i}n Riscos-Nunez }
}

@inbook{Alhazov:Aspects_of_MC:Solving_Graph_Problems:2004,
	author={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Linqiang Pan},
	title={Solving Graph Problems by {P} systems with Restricted Elementary Active
		Membranes},
	year={2004},
	publisher={Springer},
	pages={1--22},
	volume={2950},
	series={Lecture Notes in Computer Science},
	booktitle={Aspects of Molecular Computing - Essays dedicated to Tom Head on the occasion
		of his 70th birthday},
	editor={Nata{\u s}a Jonoska and Gheorghe P{\u a}un and Grzegorz Rozenberg }
}

@inbook{Martin:MC_Results_problems:2004,
	author={Carlos Mart{\'i}n-Vide and Andrei P{\u a}un and Gheorghe P{\u a}un},
	title={Membrane Computing: New Results, New Problems},
	year={2004},
	publisher={World Scientific Publishing Co. Pte. Ltd},
	pages={613--623},
	booktitle={Current Trends in Theoretical Computer Science. The challenge of the new
		century. Vol 2. Formal Models and Semantics},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa }
}

@inbook{Martin-Vide:MMB:Symport_Antiport_Syrvey:2004,
	author={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={{P} systems with Symport/Antiport Rules. A Survey},
	year={2004},
	publisher={Springer},
	pages={175--192},
	series={Natural Computing Series},
	booktitle={Modelling in Molecular Biology},
	editor={Gabriel Ciobanu and Grzegorz Rozenberg }
}

@inbook{Martin:Language_generating:2004,
	author={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Language generating by means of Membrene Systems},
	year={2004},
	publisher={World Scientific Publishing Co. Pte. Ltd},
	pages={599--611},
	booktitle={Current Trends in Theoretical Computer Science. The challenge of the new
		century. Vol 2. Formal Models and Semantics},
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa }
}

@inbook{Besozzi:A_survey_of_latest:2004,
	author={Daniela Besozzi and Giancarlo Mauri and Claudio Zandron},
	title={A survey of latest results on {P} systems with deadlock},
	year={2004},
	publisher={Kronos Editorial},
	pages={17--46},
	address={Sevilla},
	note={To appear},
	booktitle={Recent Results in Natural Computing},
	editor={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jimenez and Fernando Sancho-Caparrini
		}

@inbook{Bernardini:Aspects_of_MC:Eilenberg:2004,
	author={Francesco Bernardini and Marian Gheorghe and Mike Holcombe},
	title={Eilenberg {P} systems with Symbol-Objects},
	year={2004},
	publisher={Springer},
	pages={49--60},
	volume={2950},
	series={Lecture Notes in Computer Science},
	booktitle={Aspects of Molecular Computing - Essays dedicated to Tom Head on the occasion
		of his 70th birthday},
	editor={Nata{\u s}a Jonoska and Gheorghe P{\u a}un and Grzegorz Rozenberg }
}

@inbook{Freund:Aspects_of_MC:Splicing:2004,
	author={Franziska Freund and Rudolf Freund and Marion Oswald},
	title={Splicing Test Tube Systems and Their Relation to Splicing Membrane Systems},
	year={2004},
	publisher={Springer},
	pages={139--151},
	volume={2950},
	series={Lecture Notes in Computer Science},
	booktitle={Aspects of Molecular Computing - Essays dedicated to Tom Head on the occasion
		of his 70th birthday},
	editor={Nata{\u s}a Jonoska and Gheorghe P{\u a}un and Grzegorz Rozenberg }
}

@inbook{Paun:Membrane_computing_Main_ideas:2004,
	author={Gheorghe P{\u a}un},
	title={Membrane computing: Main ideas, basic results, applications},
	year={2004},
	publisher={Idea Group Publ.},
	address={London},
	booktitle={Molecular Computational Models: Unconventional Approaches},
	editor={Marian Gheorghe }
}

@inbook{Paun:Aspects_of_MC:Non_standard:2004,
	author={Gheorghe P{\u a}un},
	title={Membrane Computing: Some Non-standard Ideas},
	year={2004},
	publisher={Springer},
	pages={322--337},
	volume={2950},
	series={Lecture Notes in Computer Science},
	booktitle={Aspects of Molecular Computing - Essays dedicated to Tom Head on the occasion
		of his 70th birthday},
	editor={Nata{\u s}a Jonoska and Gheorghe P{\u a}un and Grzegorz Rozenberg }
}

@inbook{Paun:Membrane_Computing_Some_Recent:2004,
	author={Gheorghe P{\u a}un},
	title={Membrane computing. {S}ome recent results and current research topics},
	year={2004},
	publisher={Kronos Editorial},
	address={Sevilla},
	booktitle={Recent Results in Natural Computing},
	editor={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini
		}

@inbook{Sempere:Complexity_applications:2004,
	author={Jos{\'e} M. Sempere},
	title={Complexity applications of covering rules in {P} systems},
	year={2004},
	publisher={Kronos Editorial},
	pages={277--291},
	address={Sevilla},
	note={To appear},
	booktitle={Recent Results in Natural Computing},
	editor={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jimenez and Fernando Sancho-Caparrini
		}

@inbook{Kari:Aspects_of_MC:minimal_symport:2004,
	author={Lila Kari and Carlos Mart{\'i}n-Vide and Andrei P{\u a}un},
	title={On the Universality of {P} systems with Minimal Symport/Antiport Rules},
	year={2004},
	publisher={Springer},
	pages={254--265},
	volume={2950},
	series={Lecture Notes in Computer Science},
	booktitle={Aspects of Molecular Computing - Essays dedicated to Tom Head on the occasion
		of his 70th birthday},
	editor={Nata{\u s}a Jonoska and Gheorghe P{\u a}un and Grzegorz Rozenberg }
}

@inbook{PerezJ:Aspects_of_MC:P_versus_MP:2004,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	title={The {P} versus {NP} problem through cellular computing with membranes},
	year={2004},
	publisher={Springer},
	pages={338--352},
	volume={2950},
	series={Lecture Notes in Computer Science},
	booktitle={Aspects of Molecular Computing - Essays dedicated to Tom Head on the occasion
		of his 70th birthday},
	editor={Nata{\u s}a Jonoska and Gheorghe P{\u a}un and Grzegorz Rozenberg }
}

@inbook{Perez-Jimenez:MC_as_production_systems:2004,
	author={Mario J. P{\'e}rez-Jim{\'e}nez and Francisco Jos{\'e} Romero-Campero},
	title={Membrane computing as production systems},
	year={2004},
	publisher={Kronos Editorial},
	pages={167--204},
	address={Sevilla},
	note={To appear},
	booktitle={Recent Results in Natural Computing},
	editor={Mario J. P{\'e}rez-Jim{\'e}nez and Alvaro Romero-Jimenez and Fernando Sancho-Caparrini
		}

@inbook{Georgiu:MBDinCom_Graphics:App_of_MC:2005,
	author={Alexandros Georgiou and Marian Gheorghe and Francesco Bernardini},
	title={Membrane Based Devices Used in Computer Graphics},
	year={2005},
	publisher={Springer-Verlag},
	pages={253--280},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Alhazov:Static_Sorting_P_Sys:App_of_MC:2005,
	author={Artion Alhazov and Dragos Sburlan},
	title={Static Sorting {P} Systems},
	year={2005},
	publisher={Springer-Verlag},
	pages={215--252},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Ciobanu:Cell_Mediating_immunity:App_of_MC:2005,
	author={Gabriel Ciobanu},
	title={Modeling Cell--Mediated Immunity by Means of {P} Systems},
	year={2005},
	publisher={Springer-Verlag},
	pages={157--178},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Ardelean:PS_Mechanosensitive_Channels:2005,
	author={Ioan I. Ardelean and Daniela Besozzi and M.H. Garzon and Giancarlo Mauri
		and S. Roy},
	title={P System Models for Mechanosensitive Channels},
	year={2005},
	publisher={Springer-Verlag},
	pages={43--80},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Gutierrez:MC_Software:App_of_MC:2005,
	author={Miguel Angel Gutierrez-Naranjo and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'i}n Riscos-Nu{\~n}ez},
	title={Available Membrane Computing Software},
	year={2005},
	publisher={Springer-Verlag},
	pages={411--438},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Michel:Analysis_Public_Key_Protocol:App_of_MC:2005,
	author={Olivier Michel and Florent Jacquemard},
	title={An Analysis of a Public--Key Protocol with Membranes},
	year={2005},
	publisher={Springer-Verlag},
	pages={281--300},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Gramatovici:Parsing_with_P_Automata:App_of_MC:2005,
	author={Radu Gramatovici and Gemma Bel-Enguix},
	title={Parsing with {P} Automata},
	year={2005},
	publisher={Springer-Verlag},
	pages={389--412},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Nishida:MCModelPhotosynthesis:App_of_MC:2005,
	author={Taishin Yasunobu Nishida},
	title={A Membrane Computing Model of Photosynthesis},
	year={2005},
	publisher={Springer-Verlag},
	pages={179--200},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Yasunobu:NP_Complete_Opt:App_of_MC:2005,
	author={Taishin Yasunobu Nishida},
	title={Membrane Algorithms: Approximate Algorithms for NP-Complete Optimization
		Problems},
	year={2005},
	publisher={Springer-Verlag},
	pages={301--312},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Suzuki:p53Signaing:App_of_MC:2005,
	author={Yasuhiro Suzuki and Hiroshi Tanaka},
	title={Modeling p53 Signaling Pathways by Using Multiset Processing},
	year={2005},
	publisher={Springer-Verlag},
	pages={201--214},
	booktitle={Applications of Membrane Computing},
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez }
}

@inbook{Lakshmanan:computational_efficiency:2006,
	author={K. Lakshmanan and R. Rama},
	title={The computational efficiency of insertion deletion tissue {P} systems},
	year={2006},
	publisher={World Scientific},
	address={Singapore},
	booktitle={Formal Models, Languages and Applications},
	editor={K.G. Subramanian, K. Rangarajan, M. Mukund }
}

@inbook{Krishna:Towards_reducing_parallelism:2006,
	author={S.N. Krishna and R. Rama},
	title={Towards reducing parallelism in {P} systems},
	year={2006},
	publisher={World Scientific},
	address={Singapore},
	booktitle={Formal Models, Languages and Applications},
	editor={K.G. Subramanian, K. Rangarajan, M. Mukund }
}

@proceedings{PPWMP:CdeA:2000,
	editor={Cristian Calude and Michael J. Dinneen and Gheorghe P{\u a}un},
	title={Pre-Proceedings of Workshop on Multiset Processing, Curtea de Arges, Romania,
		August 2000},
	year={2000},
	month={August}
}

@proceedings{CDMTCS_TR140_CDMTCS_2000,
	editor={Cristian Calude and Michael J. Dinneen and Gheorghe P{\u a}un},
	title={Technical Report 140, CDMTCS, Univ. Auckland, New Zealand, 2000},
	year={2000},
	note={320 pages}
}

@proceedings{RJIST:4:1-2:2001,
  title        = {Romanian Journal of Information Science and Technology},
  year         = {2001},
  editor       = {Dan Dascalu},
  volume       = {4},
  number       = {1-2},
  url          = {http://www.imt.ro/Romjist/Volum4/Number4_1/cuprins4_1.htm#},
}

@proceedings{PPWMC:CdeA_R:2001,
	editor={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Pre-Proceedings of Workshop on Membrane Computing, Curtea de Arges, Romania,
		August 2001},
	year={2001},
	month={August}
}

@proceedings{TR_16/01:URiV:2001,
	editor={Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Technical Report 16/01, University Rovira i Virgili, Tarragona, Spain, 2001},
	year={2001},
	note={266 pages}
}

@proceedings{Multiset_Processing:2001,
	editor={Cristian Calude and Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa},
	title={Multiset Processing. Mathematical, Computer Science, Molecular Computing
		Points of View},
	publisher={Springer-Verlag},
	year={2001},
	address={Berlin},
	note={360 + viii pages},
	volume={2235},
	series={Lecture Notes in Computer Science}
}

@proceedings{DBLP:conf/umc/2000,
	editor={Ioannis Antoniou and Cristian Calude and Michael J. Dinneen},
	title={Unconventional Models of Computation, UMC'2K, Proceedings of the Second
		International Conference, Brussel, Belgium, 13-16 December 2000},
	publisher={Springer},
	year={2001},
	isbn={1-85233-415-0}
}

@proceedings{Fundamenta_Informaticae:49:1-3:2002,
  title        = {Fundamenta Informaticae},
  year         = {2002},
  editor       = {Andrzej Skowron},
  volume       = {49},
  number       = {1-3},
  url          = {http://fi.mimuw.edu.pl/#},
}

@proceedings{PPWMC:CdeA_R:2002,
	editor={Gheorghe P{\u a}un and Claudio Zandron},
	title={Pre-Proceedings of Workshop on Membrane Computing, Curtea de Arges, Romania,
		August 2002},
	year={2002},
	month={August},
	note={and MolCoNet Publucation Nº 1, 2002 (394 pages)}
}

@proceedings{PPWMC:Tarr:2004,
	editor={Artiom Alhazov and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Preproceedings of the WorkShop on Membrane Computing, Tarragona, July 17-22
		2003},
	year={2003}
}

@proceedings{WMC_CdeA:2002,
	editor={Gheorghe P{\u a}un and Grzegorz Rozenberg and Arto Salomaa and Claudio Zandron},
	title={Membrane Computing. International Workshop, WMC-CdeA 2002, Curtea de Arges,
		Romania, August 19-23, 2002, Revised Papers},
	publisher={Springer-Verlag},
	year={2003},
	address={Berlin},
	note={423 + viii pages},
	volume={2597},
	url={http://link.springer.de/link/service/series/0558/tocs/t2597.htm#},
	series={Lecture Notes in Computer Science},
	isbn={3-540-00611-7}
}

@proceedings{BioSystems_CellComputing:2003,
	editor={Marian Gheorghe and Mike Holcombe},
	title={BioSystems-Cell Computing},
	publisher={Elsevier Ireland Ltd.},
	year={2003},
	month={July},
	note={Pages 83--186},
	volume={70},
	number={2}
}

@proceedings{BWMC:2003,
	editor={Matteo Cavaliere and Carlos Mart{\'i}n-Vide and Gheorghe P{\u a}un},
	title={Brainstorming Week on Membrane Computing, Tarragona, February 5-11 2003},
	year={2003}
}

@proceedings{DBLP:conf/membrane/2003,
	editor={Carlos Mart{\'i}n-Vide and Giancarlo Mauri and Gheorghe P{\u a}un and Grzegorz
		Rozenberg and Arto Salomaa},
	title={Membrane Computing, International Workshop, WMC 2003, Tarragona, Spain,
		July 17-22, 2003, Revised Papers},
	publisher={Springer-Verlag},
	year={2004},
	volume={2933},
	series={Lecture Notes in Computer Science},
	isbn={3-540-20895-X}
}

@proceedings{BWMC:SVQ:2004,
	editor={Gheorghe P{\u a}un and Agust{\'i}n Riscos-N{\'u}{\~n}ez and Alvaro Romero-Jim{\'e}nez
		and Fernando Sancho-Caparrini},
	title={Second Brainstorming Week on Membrane Computing, Sevilla, Spain, Feb 2-7,
		2004},
	year={2004}
}

@proceedings{WMC5:Milano:2004,
	editor={Giancarlo Mauri and Gheorghe P{\u a}un and Claudio Zandron},
	title={Pre-proceedings of the Fifth Workshop on Membrane Computing (WMC5)},
	year={2004},
	month={June},
	address={Milano. Italy},
	note={446 pages}
}

@proceedings{Jonoska:NewGenerationComputing:MC:2004,
	editor={K. Furukawa and T. Sato and T. Chikayama},
	title={New Generation Computing. Special Feature. Membrane Computing},
	publisher={Ohmsha, Ltd. and Springer},
	year={2004},
	month={August},
	volume={22},
	number={4}
}

@proceedings{Ciobanu:Applications_of_MC:2005,
	editor={Gabriel Ciobanu and Gheorghe P{\u a}un and Mario J. P{\'e}rez-Jim{\'e}nez},
	title={Applications of Membrane Computing},
	publisher={Springer-Verlag},
	year={2005},
	note={(442 + viii pages) - in press}
}

@proceedings{Mauri:WMC5:2005,
	editor={Giancarlo Mauri and Gheorghe P{\u a}un and Mario J. Perez-Jimenez and Grzegorz
		Rozenberg and Arto Salomaa},
	title={Membrane Computing, International Workshop, WMC5, Milano, Italy, 2004, Selected
		Papers},
	publisher={Springer-Verlag},
	year={2005},
	note={(417 + viii pages)},
	volume={3365},
	series={Lecture Notes in Computer Science}
}

@book{Paun:Membrane_computing:Springer:2002,
  author       = {Gheorghe P{\u a}un},
  title        = {Membrane Computing. {A}n Introduction},
  publisher    = {Springer-Verlag},
  year         = {2002},