@article {236, title = {2006 Reseacrh Topics in Membrane Computing}, journal = {Fourth Brainstorming Week on Membrane Computing }, volume = {II}, year = {2006}, month = {1/30/06-2/3/06}, pages = {235-251}, publisher = {F{\'e}nix Editora}, address = {Sevilla, Espa{\~n}a}, isbn = {84-611-0519-2}, author = {Gheorghe Paun}, editor = {Carmen Graciani-D{\'\i}az and Gheorghe Paun and {\'A}lvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini} }