@book{903,
	author = {Kelsen, Hans, 1881-1973},
	title = {Teoría pura del derecho :},
	publisher = {EUDEA,},
	year = {1965},
	address = {Buenos Aires :},
	edition = {4},
	note = {Título original : Theorie pure du droit : Introduction a la science du droit}
}