Membrane Computing - WMC 2004; Kanade, Takeo; Mauri, Gian Carlo; Paun, Gheorghe; PÃ©rez-JimÃ©nez, Mario J.; Rozenberg, Grzegorz; Salomaa, Arto; Pérez-Jiménez, Mario J. (Springer Berlin / Heidelberg, 2005)