@article {2088,
	title = {Limits on Efficient Computation in P Systems with Symport/Antiport},
	journal = {Fifteenth Brainstorming Week on Membrane Computing (BWMC2017)},
	year = {2017},
	pages = {147-160},
	publisher = {F{\'e}nix Editora},
	url = {http://www.gcn.us.es/15bwmc_proceedings},
	author = {Luis F. Mac{\'\i}as-Ramos and Bosheng Song and Tao Song and Linqiang Pan and Mario J. P{\'e}rez-Jim{\'e}nez}
}
