@article {805, title = {Guest Editorial Preface. Special Issue on Membrane Computing}, journal = {International Journal of Natural Computing Research}, volume = {2}, year = {2011}, month = {07/2011}, pages = {i-iii}, publisher = {IGI Global}, address = {Hershey, Pennsylvania (USA)}, issn = {1947-928X}, doi = {10.4018/jncr.2011070105}, url = {http://www.igi-global.com/journal/international-journal-natural-computing-research/1148}, author = {Pierluigi Frisco and Gheorghe Paun and Mario J. P{\'e}rez-Jim{\'e}nez} }