@article {,
	title = {Formal languages and Applications},
	year = {2004},
	pages = {620},
	publisher = {Springer-Verlag},
	address = {Berl{\'\i}n, Alemania},
	isbn = {3-540-20907-7},
	author = {Gheorghe Paun and Victor Mitrana and Carlos Mart{\'\i}n-Vide}
}
