@book{3246,
	author = {MEXICO. [LEYES, ETC.]. and PETROLEOS MEXICANOS (MEXICO).},
	title = {LEY GENERAL DEL EQUILIBRIO ECOLOGICO Y LA  PROTECCION ALAMBIENTE.},
	publisher = {PEMEX},
	year = {1990},
	address = {MEXICO: },
	note = {INCLUYE INDICE.}
}