Membrane Computing : 10th International Workshop, WMC 2009, Curtea de Arges, Romania, August 24-27, 2009. Revised Selected and Invited Papers - Gheorghe P.un, Mario J. Pérez-Jiménez, Agustín Riscos-Núñez, Grzegorz Rozenberg, Arto Salomaa ((Lecture Notes in Computer Science))