@article {,
	title = {An approach to computational complexity in Membrane Computing},
	journal = {Brainstorming Workshop on Uncertainty in Membrane Computing},
	year = {2004},
	month = {November 8-10},
	pages = {67-94},
	publisher = {Department de Matem{\`a}tiques i Inform{\`a}tica de la Universitat de les Illes Balears},
	address = {Palma de Mallorca},
	isbn = {84-7632-897-4},
	author = {Mario J. P{\'e}rez-Jim{\'e}nez}
}
