@article {263,
	title = {Matrix Languages, Register Machines, Vector Addition Systems},
	journal = {Third Brainstorming Week on Membrane Computing},
	year = {2005},
	month = {1/31//05-2/4/05},
	pages = {155-167},
	publisher = {F{\'e}nix Editora},
	address = {Sevilla, Espa{\~n}a},
	isbn = {84-609-6771-9},
	author = {Rudolf Freund and Oscar Ibarra and Gheorghe Paun and H. C. Yen},
	editor = {M. A. Guti{\'e}rrez Naranjo and Agust{\'\i}n Riscos-N{\'u}{\~n}ez and Francisco J. Romero-Campero and Dragos Sburlan}
}
