%0 Generic %D 2003 %T Complexity Classes in Cellular Computing with Membranes %A Mario J. Pérez-Jiménez %A Álvaro Romero-Jiménez %A Fernando Sancho-Caparrini %E Matteo Cavaliere %E Carlos Martín-Vide %E Gheorghe Paun %C Tarragona (Spain) %P 270-278 %S Brainstorming Week on Membrane Computing %8 5-11/02/2003