@book{26271,
	author = {Lipschutz, Seymour},
	title = {Theory and problems of set theory and related topics  /},
	publisher = {McGraw Hill, },
	year = {1998},
	series = {Schaum's outline series},
	address = {New York  },
	edition = {2a ed.},
	note = {Incluye índice}
}