@book{32162,
	author = {López G., Juan José.},
	title = {Ecosistema (Opuntia streptacantha Lemaire)},
	publisher = {Universidad Agraria Antonio Narro,},
	year = {1977},
	series = {Monografía técnico-científica, 3},
	address = {Saltillo, Coah. :}
}