@article {533,
	title = {Computationally Hard Problems Addressed Through P Systems},
	journal = {Applications of Membrane Computing},
	year = {2006},
	pages = {315-346},
	publisher = {Springer-Verlag Berlin Heidelberg},
	chapter = {12},
	address = {Germany},
	isbn = {978-3-540-25017-3},
	doi = {10.1007/3-540-29937-8_12},
	url = {http://dx.doi.org/10.1007/3-540-29937-8_12},
	author = {Mario J. P{\'e}rez-Jim{\'e}nez and {\'A}lvaro Romero-Jim{\'e}nez and Fernando Sancho-Caparrini},
	editor = {Gabriel Ciobanu and Gheorghe Paun and Mario J. P{\'e}rez-Jim{\'e}nez}
}
