@book{904,
	author = {Kelsen, Hans, 1881-1973},
	title = {Teoría pura del derecho.},
	publisher = {UNAM,},
	year = {1981},
	series = {UNAM. IIJ. Serie G. Estudios Doctrinales ;},
	address = {México :},
	note = {Título original: "Reine rechtslehre"}
}