@article {1912,
	title = {Minimal cooperation in P systems with symport/antiport: A complexity approach},
	journal = {Thirteenth Brainstorming Week on Membrane Computing},
	year = {2015},
	month = {02/2015},
	pages = {301-323},
	publisher = {F{\'e}nix Editora},
	edition = {1},
	address = {Sevilla, Espa{\~n}a},
	url = {http://www.cs.us.es/~marper/investigacion/proceedings-13th-BWMC.pdf},
	author = {Luis Valencia-Cabrera and Bosheng Song and Luis F. Mac{\'\i}as-Ramos and Linqiang Pan and Agust{\'\i}n Riscos-N{\'u}{\~n}ez and Mario J. P{\'e}rez-Jim{\'e}nez}
}
