Pérez-Hurtado, I., Orellana-Martín D., Martínez-del-Amor M. Á., Valencia-Cabrera L., & Riscos-Núñez A.  (2022).??A new P-Lingua toolkit for agile development in membrane computing.  Information Sciences. 587, 1-22.

Orellana-Martín, D., Martínez-del-Amor M. A., Valencia-Cabrera L., Pérez-Hurtado I., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2021).??Dendrite P Systems toolbox: representation, algorithms and simulators.  International Journal of Neural Systems. 31(1),?2050071.

Pérez-Hurtado, I., Orellana-Martín D., Martínez-del-Amor M. A., & Valencia-Cabrera L.  (2021).??A membrane computing framework for social navigation in robotics.  Computers and Electrical Engineering. 95, 107408.

Martínez-del-Amor, M. A., Orellana-Martín D., Pérez-Hurtado I., Cabarle F. G. C., & Adorna H. N.  (2021).??Simulation of Spiking Neural P Systems with Sparse Matrix-Vector Operations.  Processes. 9(4),?

Song, B., Li K., Orellana-Martín D., Pérez-Jiménez M. J., & Pérez-Hurtado I.  (2021).??A Survey of Nature-Inspired Computing: Membrane Computing.  ACM Computing Surveys. 54, Article no 22.

Valencia-Cabrera, L., Orellana-Martín D., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2020).??From NP-Completeness to DP-Completeness: A Membrane Computing Perspective.  Complexity. 2020, 10.

Martínez-del-Amor, M. A., Doncel-Ramírez A., Orellana-Martín D., & Pérez-Hurtado I.  (2020).??Simulating Population Dynamics P systems with extra parallelism.  International Conference on Membrane Computing (ICMC2020).  

Martínez-del-Amor, M. A., Pérez-Hurtado I., Orellana-Martín D., & Pérez-Jiménez M. J.  (2020).??Adaptative parallel simulators for bioinspired computing models.  Future Generation Computer Systems. 107, 469-484.

Martínez-del-Amor, M. A., Doncel-Ramírez A., Orellana-Martín D., & Pérez-Hurtado I.  (2020).??Extracting Parallelism in Simulation Algorithms for PDP systems.  18th Brainstorming Week on Membrane Computing (BWMC2020).  79-90.

Pérez-Hurtado, I., Martínez-del-Amor M. A., Zhang G., Neri F., & Pérez-Jiménez M. J.  (2020).??A membrane parallel rapidly-exploring random tree algorithm for robotic motion planning.  Integrated Computer-Aided Engineering. 27(2),?121-138.

Valencia-Cabrera, L., Pérez-Hurtado I., & Martínez-del-Amor M. A.  (2020).??Simulation challenges in membrane computing.  Journal of Membrane Computing. 2, 392?402.

Peng, H., Li B., Wang J., Song X., Wang T., Valencia-Cabrera L., et al.  (2020).??Spiking neural P systems with inhibitory rules.  Knowledge-Based Systems. 188, 105064.

Orellana-Martín, D., Martínez-del-Amor M. A., Pérez-Hurtado I., Riscos-Núñez A., Valencia-Cabrera L., & Pérez-Jiménez M. J.  (2020).??When object production tunes the efficiency of membrane systems.  Theoretical Computer Science. 805, 218-231.

Pérez-Hurtado, I., Orellana-Martín D., Zhang G., & Pérez-Jiménez M. J.  (2019).??P-Lingua in two steps: flexibility and efficiency.  Journal of Membrane Computing. 1, 93?102.

Pérez-Hurtado, I., Orellana-Martín D., Martínez-del-Amor M. A., Valencia-Cabrera L., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2019).??11 years of P-Lingua: A backward glance.  20th International Conference on Membrane Computing, CMC20.  451-462.

Valencia-Cabrera, L., Orellana-Martín D., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2019).??Dependency Graph Technique Revisited.  20th International Conference on Membrane Computing, CMC20.  513-522.

Martínez-del-Amor, M. A., Orellana-Martín D., Pérez-Hurtado I., Valencia-Cabrera L., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2019).??Design of Specific P Systems Simulators on GPUs.  (Thomas Hinze, Grzegorz Rozenberg, Arto Salomaa, Claudio Zandron, Ed.).Membrane Computing. 11399(2-3),?202?207.

Valencia-Cabrera, L., Orellana-Martín D., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2019).??New applications for an old tool.  Seventeenth Brainstorming Week on Membrane Computing.  165-170.

Pérez-Hurtado, I., Martínez-del-Amor M. A., Zhang G., Neri F., & Pérez-Jiménez M. J.  (2019).??Solving the feasibility problem in robotic motion planning by means of Enzymatic Numerical P systems.  The 8th Asian Conference on Membrane Computing (ACMC2019).  

Peng, H., Li B., Wang J., Song X., Wang T., Valencia-Cabrera L., et al.  (2019).??Spiking neural P systems with inhibitory rules.  Knowledge-Based Systems.  105064.

Pérez-Hurtado, I., Orellana-Martín D., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2019).??A syntax for semantics in P-Lingua.  Seventeenth Brainstorming Week on Membrane Computing.  139-150.

Valencia-Cabrera, L., Graciani C., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2018).??A Decade of Ecological Membrane Computing Applications.  Bulletin of the International Membrane Computing Society. 6, 39-50.

Valencia-Cabrera, L., Martínez-del-Amor M. A., & Pérez-Hurtado I.  (2018).??A Simulation Workflow for Membrane Computing: From MeCoSim to PMCGPU Through P-Lingua.  (Carmen Graciani, Agustín Riscos-Núñez, Gheorghe P?un, Gregorz Rozenberg, Arto Salomaa, Ed.).Enjoying Natural Computing: Essays Dedicated to Mario de Jesús Pérez-Jiménez on the Occasion of His 70th Birthday.  291-303.

Pérez-Hurtado, I., Pérez-Jiménez M. J., Zhang G., & Orellana-Martín D.  (2018).??Robot path planning using rapidly-exploring random trees: A membrane computing approach.  7th International Conference on Computers Communications and Control (ICCCC2018).  

Martínez-del-Amor, M. A., Orellana-Martín D., Pérez-Hurtado I., Valencia-Cabrera L., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2018).??Simulation of Computing P Systems: A GPU Design for the Factorization Problem.  19th International Conference on Membrane Computing.  239-242.

Valencia-Cabrera, L., Martínez-del-Amor M. A., Orellana-Martín D., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2017).??Cooperative P Systems and the P versus NP Problem.  Bulletin of the International Membrane Computing Society. 4, 39-64.

Pérez-Hurtado, I.  (2017).??Generation of rapidly-exploring random tree by using a new class of membrane systems.  Asian Conference on Membrane Computing (ACMC 2017).  534-546.

Colomer, A. M., García-Quismondo M., Macías-Ramos L. F., Martínez-del-Amor M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., et al.  (2014).??Membrane System-Based Models for Specifying Dynamical Population Systems.  Applications of Membrane Computing in Systems and Synthetic Biology. 7, 97-132.

Pérez-Hurtado, I., Valencia-Cabrera L., Chacón J. M., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2014).??A P-Lingua based Simulator for Tissue P Systems with Cell Separation.  Romanian Journal of Information Science and Technology. 17(1),?89-102.

Martínez-del-Amor, M. A., Pérez-Hurtado I., García-Quismondo M., Macías-Ramos L. F., Valencia-Cabrera L., Romero-Jiménez Á., et al.  (2013).??DCBA: Simulating population dynamics P systems with proportional objects distribution.  (Erzsebet Csuhaj-Varjú, Marian Gheorghe, Grzegorz Rozenberg, Arto Salomaa, György Vaszil, Ed.).Lecture Notes in Computer Science.  257-276.

Freund, R., Pérez-Hurtado I., Riscos-Núñez A., & Verlan S.  (2013).??A formalization of membrane systems with dynamically evolving structures.  International Journal of Computer Mathematics. 90(4),?801-815.

Pérez-Hurtado, I., Valencia-Cabrera L., Chacón J. M., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2013).??A P-Lingua based simulator for tissue P systems with cell separation.  (Gexiang Zhang, Y. Wang, J. Cheng, T. Wang, Ed.).Second Asian Conference on Membrane Computing.  208-220.

Graciani-Díaz, C., Gutiérrez-Naranjo M. A., Pérez-Hurtado I., Riscos-Núñez A., & Romero-Jiménez Á.  (2013).??A Rete-based Algorithm for Rule Selection in P Systems.  International Journal of Unconventional Computing. 9(5-6),?367-384.

Martínez-del-Amor, M. A., Paun G., Pérez-Hurtado I., & Romero-Campero F. J.  (2012).??Proceedings of the Tenth Brainstorming Week on Membrane Computing.  Tenth Brainstorming Week on Membrane Computing. I, xiv+318.

Martínez-del-Amor, M. A., Pérez-Hurtado I., García-Quismondo M., Macías-Ramos L. F., Valencia-Cabrera L., Romero-Jiménez Á., et al.  (2012).??DCBA: Simulating population dynamics P systems with proportional object distribution.  13th International Conference on Membrane Computing (CMC13).  291-310.

Freund, R., Pérez-Hurtado I., Riscos-Núñez A., & Verlan S.  (2012).??A formal framework for P systems with dynamic structure.  13th International Conference on Membrane Computing (CMC13).  199-210.

Martínez-del-Amor, M. A., Pérez-Hurtado I., García-Quismondo M., Macías-Ramos L. F., Valencia-Cabrera L., Romero-Jiménez Á., et al.  (2012).??DCBA: Simulating Population Dynamics P Systems with Proportional Object Distribution.  Tenth Brainstorming Week on Membrane Computing. II, 27-56.

Freund, R., Pérez-Hurtado I., Riscos-Núñez A., & Verlan S.  (2012).??A Formal Framework for P Systems with Dynamic Structure.  Tenth Brainstorming Week on Membrane Computing. I, 111-122.

Ipate, F., Lefticaru R., Pérez-Hurtado I., Pérez-Jiménez M. J., & Tudose C.  (2012).??Formal verification of P systems with active membranes through model checking.  Lecture Notes in Computer Science. 7184, 215-225.

Macías-Ramos, L. F., Pérez-Hurtado I., García-Quismondo M., Valencia-Cabrera L., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2012).??A P-Lingua based simulator for Spiking Neural P systems.  Lecture Notes in Computer Science. 7184, 257-281.

Martínez-del-Amor, M. A., Pérez-Hurtado I., Gastalver-Rubio A., Elster A. C., & Pérez-Jiménez M. J.  (2012).??Population Dynamics P Systems on CUDA.  (Gilbert, David, Heiner, Monika, Ed.).Lecture Notes in Bioinformatics. 7605, 247-266.

Martínez-del-Amor, M. A., Paun G., Pérez-Hurtado I., Romero-Campero F. J., & Valencia-Cabrera L.  (2011).??Proceedings of the Ninth Brainstorming Week on Membrane Computing.  Ninth Brainstorming  Week on Membrane Computing.  xiv+374.

Ipate, F., Lefticaru R., Pérez-Hurtado I., Pérez-Jiménez M. J., & Tudose C.  (2011).??Formal VeriÌation of P Systems with Active Membranes through Model Checking.  12th International Conference on Membrane Computing (CMC12).  241-252.

Macías-Ramos, L. F., Pérez-Hurtado I., García-Quismondo M., Valencia-Cabrera L., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2011).??A P-Lingua based Simulator for Spiking Neural P Systems.  Proceedings of the 12th International Conference on Membrane Computing (CMC12).  323-346.

Colomer, A. M., Lavín S., Marco I., Margalida A., Pérez-Hurtado I., Pérez-Jiménez M. J., et al.  (2011).??Modeling population growth of Pyrenean Chamois (Rupicapra p. pyrenaica) by using P systems.  Lecture Notes in Computer Science. 6501, 144-159.

Colomer, A. M., Pérez-Hurtado I., Riscos-Núñez A., & Pérez-Jiménez M. J.  (2011).??Comparing simulation algorithms for multienvironment probabilistic P system over a standard virtual ecosystem.  Natural Computing. 11, 369-379.

Cardona, M., Colomer M. A., Margalida A., Palau A., Pérez-Hurtado I., Pérez-Jiménez M. J., et al.  (2011).??A computational modeling for real ecosystems based on P systems.  Natural Computing. 10(1),?39-53.

Pérez-Hurtado, I., Pérez-Jiménez M. J., Riscos-Núñez A., & Romero-Campero F. J.  (2011).??Membrane Computing (Tutorial).  Lecture Notes in Computer Science. 6714, 38-39.

Pérez-Hurtado, I., Pérez-Jiménez M. J., Riscos-Núñez A., Gutiérrez-Naranjo M. A., & Rius-Font M.  (2011).??On a partial affirmative answer for a Paun's conjecture.  International Journal of Foundations of Computer Science. 22(1),?55-64.

Martínez-del-Amor, M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., Riscos-Núñez A., & Sancho-Caparrini F.  (2011).??A simulation algorithm for multienvironment probabilistic P systems: A formal verification.  International Journal of Foundations of Computer Science. 22(1),?107-118.

Riscos-Núñez, A., & Pérez-Hurtado I.  (2010).??Length of rules and tractability in tissue-like P systems.  Algebraic Computing, Soft Computing, and Program Verification.  

Riscos-Núñez, A., & Pérez-Hurtado I.  (2010).??P-Lingua: a programming language for membrane computing.  Algebraic Computing, Soft Computing, and Program Verification.  

Martínez-del-Amor, M. A., Cecilia J. M., Guerrero G. D., & Pérez-Hurtado I.  (2010).??An Overview of P System Simulation on GPUs.  I Jornadas Jóvenes Investigadores.  2-7.

Martínez-del-Amor, M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., Riscos-Núñez A., & Colomer A. M.  (2010).??A new simulation algorithm for multienvironment probabilistic P systems.  (K. Li, Z. Tang, R. Li, Atulya Nagar, R. Thamburaj, Ed.).IEEE Fifth International Conference on Bio-inpired Computing: Theories and Applications (BIC-TA 2010). 1, 59-68.

Colomer, A. M., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2010).??Simulating Tritrophic Interactions by Means of P Systems.  (Atulya Nagar, R. Thamburaj, K. Li, Z. Tang, R. Li, Ed.).IEEE Fifth International Conference on Bio-inpired Computing: Theories and Applications (BIC-TA 2010). 2, 637-643.

Colomer, A. M., Martínez-del-Amor M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2010).??A uniform framework for modeling based on P Systems.  (K. Li, Z. Tang, R. Li, Atulya Nagar, R. Thamburaj, Ed.).IEEE Fifth International Conference on Bio-inpired Computing: Theories and Applications (BIC-TA 2010). 1, 616-621.

Colomer, A. M., Lavín S., Marco I., Margalida A., Pérez-Hurtado I., Pérez-Jiménez M. J., et al.  (2010).??Modeling population growth of Pyrenean Chamois (Rupicapra p. pyrenayca) by using P systems.  (Marian Gheorghe, Thomas Hinze, Gheorghe Paun, Ed.).Eleventh International Conference on Membrane Computing (CMC11).  121-135.

Martínez-del-Amor, M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2010).??A P-Lingua based simulator for Tissue Psystems.  Journal of Logic and Algebraic Programming. 79(6),?374-382.

Cecilia, J. M., García J. M., Guerrero G. D., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2010).??Simulating a P system based efficient solution to SAT by using GPUs .  Journal of Logic and Algebraic Programming. 79(6),?317-325.

Cecilia, J. M., García J. M., Guerrero G. D., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2010).??Simulation of P systems with active membranes on CUDA.  Briefings in Bioinformatics. 11(3),?313-322.

Cecilia, J. M., García J. M., Guerrero G. D., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2010).??Implementing P systems parallelism by means of GPUs.  Lecture Notes in Computer Science. 5957, 227-241.

García-Quismondo, M., Gutiérrez-Escudero R., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2010).??An overview of P-Lingua 2.0.  Lecture Notes in Computer Science. 5957, 264-288.

Cardona, M., Colomer A. M., Margalida A., Pérez-Hurtado I., Pérez-Jiménez M. J., & Sanuy D.  (2010).??A P system based model of an ecosystem of some scavenger birds.  Lecture Notes in Computer Science. 5957, 182-195.

Martínez-del-Amor, M. A., Paun G., Pérez-Hurtado I., & Riscos-Núñez A.  (2010).??Proceedings of the Eighth Brainstorming Week on Membrane Computing.  Eighth Brainstorming Week on Membrane Computing.  XI+342.

Cardona, M., Colomer A. M., Margalida A., Palau A., Pérez-Hurtado I., Pérez-Jiménez M. J., et al.  (2010).??A computational modeling for real ecosystems based on P systems.  Natural Computing. 10(1),?39-53.

Pérez-Hurtado, I., Valencia-Cabrera L., Pérez-Jiménez M. J., Colomer A. M., & Riscos-Núñez A.  (2010).??MeCoSim: A general purpose software tool for simulating biological phenomena by means of P Systems.  (K. Li, Z. Tang, R. Li, Atulya Nagar, R. Thamburaj, Ed.).IEEE Fifth International Conference on Bio-inpired Computing: Theories and Applications (BIC-TA 2010). I, 637-643.

Díaz-Pernil, D., Graciani-Díaz C., Gutiérrez-Naranjo M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2010).??Software for P systems.  (Gheorghe Paun, Grzegorz Rozenberg, Arto Salomaa, Ed.).The Oxford Handbook of Membrane Computing.  437-454.

Guerrero, G. D., Cecilia J. M., García J. M., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2009).??Analysis of P systems simulation on CUDA.  XX Jornadas de Paralelismo.  289-294.

Cecilia, J. M., Guerrero G. D., García J. M., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2009).??Simulation of P Systems with active membranes on CUDA.  2009 International Workshop on High Performance Computational Systems Biology.  61-71.

Cecilia, J. M., Guerrero G. D., García J. M., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2009).??A massively parallel framework using P systems and GPUs.  Symposium on Application Accelerators in High Performance Computing.  

Cardona, M., Colomer A. M., Margalida A., Pérez-Hurtado I., Pérez-Jiménez M. J., & Sanuy D.  (2009).??A P system based model of an ecosystem of some scavenger birds.  (Gheorghe Paun, Mario J. Pérez-Jiménez, Agustín Riscos-Núñez, Ed.).10th Workshop on Membrane Computing.  153-168.

García-Quismondo, M., Henley B. M., Pérez-Hurtado I., & Riscos-Núñez A.  (2009).??A first attempt to model notch signalling by means of P systems.  (Gheorghe Paun, Mario J. Pérez-Jiménez, Agustín Riscos-Núñez, Ed.).10th Workshop on Membrane Computing.  265-268.

García-Quismondo, M., Gutiérrez-Escudero R., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2009).??An overview of P-lingua 2.0.  10th Workshop on Membrane Computing.  240-264.

Martínez-del-Amor, M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., Cecilia J. M., Guerrero G. D., & García J. M.  (2009).??Simulating active membrane systems using GPUs.  (Gheorghe Paun, Mario J. Pérez-Jiménez, Agustín Riscos-Núñez, Ed.).10th Workshop on Membrane Computing.  369-384.

García-Quismondo, M., Gutiérrez-Escudero R., Martínez-del-Amor M. A., Orejuela-Pinedo E. F., & Pérez-Hurtado I.  (2009).??P-Lingua 2.0: A software framework for cell-like P systems.  International Journal of Computers, Communications and Control. IV(3),?234-243.

Cardona, M., Colomer A. M., Margalida A., Pérez-Hurtado I., Pérez-Jiménez M. J., & Sanuy D.  (2009).??P system based model of an ecosystem of the scavenger birds .  7th Brainstorming Week on Membrane Computing. I, 65-80.

García-Quismondo, M., Gutiérrez-Escudero R., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2009).??P-Lingua 2.0: New features and first applications.  7th Brainstorming Week on Membrane Computing. I, 141-168.

Gutiérrez-Escudero, R., Gutiérrez-Naranjo M. A., Paun G., Pérez-Hurtado I., & Riscos-Núñez A.  (2009).??Seventh Brainstorming Week on Membrane Computing. Volumen I.  7th Brainstorming Week on Membrane Computing. I, X+248.

Martínez-del-Amor, M. A., Orejuela-Pinedo E. F., Paun G., Pérez-Hurtado I., & Riscos-Núñez A.  (2009).??Seventh Brainstorming Week on Membrane Computing. Volumen II.  7th Brainstorming Week on Membrane Computing. II, X+254.

Martínez-del-Amor, M. A., Pérez-Hurtado I., Pérez-Jiménez M. J., Cecilia J. M., Guerrero G. D., & García J. M.  (2009).??Simulation of recognizer P systems by using manycore GPUs .  7th Brainstorming Week on Membrane Computing. II, 45-58.

Gutiérrez-Naranjo, M. A., Martínez-del-Amor M. A., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2009).??Solving the N-Queens puzzle with P systems .  7th Brainstorming Week on Membrane Computing. I, 199-210.

Díaz-Pernil, D., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2009).??A P-lingua programming environment for Membrane Computing.  Lecture Notes in Computer Science. 5391, 187-203.

Riscos-Núñez, A., Díaz-Pernil D., Pérez-Jiménez M. J., & Pérez-Hurtado I.  (2008).??A P-lingua programming environment for Membrane Computing.  9th Workshop on Membrane Computing.  187-203.

Rivero-Gil, E., Gutiérrez-Naranjo M. A., & Pérez-Jiménez M. J.  (2008).??Graphics and P systems: Experiments with JPLANT.  (Daniel Díaz-Pernil, Carmen Graciani-Díaz, Miguel A. Gutiérrez-Naranjo, Gheorghe Paun, Ignacio Pérez-Hurtado, Agustín Riscos-Núñez, Ed.).Proceedings of the Sixth Brainstorming Week on Membrane Computing.  241-254.

Díaz-Pernil, D., Pérez-Hurtado I., Pérez-Jiménez M. J., & Riscos-Núñez A.  (2008).??P-Lingua: A programming language for membrane computing .  6th Brainstorming Week on Membrane Computing. 6, 135-155.

Gutiérrez-Naranjo, M. A., Díaz-Pernil D., Graciani-Díaz C., Paun G., Pérez-Hurtado I., & Pérez-Jiménez M. J.  (2008).??Sixth brainstorming week on membrane computing.  6th Brainstorming Week on Membrane Computing.