@book{642,
	author = {KLEIMAN, ARIEL. and KLEIMAN, ELENA K.},
	title = {CONJUNTOS : },
	publisher = {LIMUSA},
	year = {1972},
	series = {COLEC. BIBLIOTECA DIDACTICA DE MATEMATICAS},
	address = {MEXICO: },
	note = {INCLUYE INDICE.}
}