@book{172040,
	author = {Spivak, Michael and Benjamín, W.A., },
	title = {Cálculo en variedades},
	publisher = {Reverté,},
	year = {1970.},
	address = {Barcelona, España :},
	edition = {1a ed.},
	note = {Incluye bibliografía e índice.}
}