@article {,
	title = {On a Paun{\textquoteright}s conjecture in membrane systems},
	journal = {Lecture Notes in Computer Science},
	volume = {4527},
	year = {2007},
	pages = {180-192},
	publisher = {Springer},
	address = {Amsterdam, The Netherlands},
	abstract = {We study a P{\u a}un{\textquoteright}s conjecture concerning the unsolvability of NP{\textendash}complete problems by polarizationless P systems with active membranes in the usual framework, without cooperation, without priorities, without changing labels, using evolution, communication, dissolution and division rules, and working in maximal parallel manner. We also analyse a version of this conjecture where we consider polarizationless P systems working in the minimally parallel manner. 
},
	isbn = {978-3-540-73052-1},
	issn = {0302-9743},
	doi = {10.1007/978-3-540-73053-8_18},
	url = {http://dx.doi.org/10.1007/978-3-540-73053-8_18},
	author = {Giancarlo Mauri and Mario J. P{\'e}rez-Jim{\'e}nez and Claudio Zandron}
}
