@book{33553,
	author = {Paulson, Stanley L. and Villar Borda, Luis,},
	title = {Fundamentacion critica de la doctrina de Hans Kelsen /},
	publisher = {Univ.Externado de Colombia,},
	year = {2000.},
	series = {Teoria juridica y filosofia del derecho ;},
	address = {Bogotá :}
}