@article {403,
	title = {Active membrane systems without charges and using only symmetric elementary division characterise P},
	journal = {8th Workshop on Membrane Computing},
	volume = {4860},
	year = {2007},
	note = {Membrane Computing
8th International Workshop, WMC 2007
Thessaloniki, Greece, June 25-28, 2007
Revised Selected and Invited Papers},
	month = {June 25-28},
	pages = {367-384},
	publisher = {Springer},
	address = {Thessaloniki, Greece},
	url = {http://www.cs.us.es/~dwoods/download/MurphyWoods-WMC07.pdf},
	author = {Niall Murphy and Damien Woods},
	editor = {George Eleftherakis and Petros Kefalas and Gheorghe Paun and Grzegorz Rozenberg and Arto Salomaa}
}
