@article {522, title = {Complexity: membrane division, membrane creation}, journal = {The Oxford Handbook of Membrane Computing}, year = {2010}, pages = {302-336}, publisher = {Oxford University Press}, chapter = {12}, address = {New York (United States)}, isbn = {978-0-19-955667-0}, url = {http://www.us.oup.com/us/catalog/general/subject/Mathematics/ComputerScience/?view=usa\&sf=toc\&ci=9780199556670}, author = {Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'\i}n Riscos-N{\'u}{\~n}ez and {\'A}lvaro Romero-Jim{\'e}nez and Damien Woods}, editor = {Gheorghe Paun and Grzegorz Rozenberg and Arto Salomaa} }