@book{5632,
	author = {Xirau, Ramón, },
	title = {El péndulo y la espiral /},
	publisher = {El Colegio Nacional, },
	year = {1994},
	address = {México, D.F. :},
	note = {El Colegio Nacional, 50 Aniversario 1943-1993},
	url = {https://www.cicy.mx/sitios/sib/doctoelectronico/5998.pdf}
}