@book{1279,
	author = {Lipschutz, Seymour and Marc lars lipson},
	title = {Theory and problems of discrete mathematics  /},
	publisher = {McGraw-Hill,},
	year = {c2008.},
	series = {Schaum's out lines},
	address = {New Delhi:},
	edition = {2nd ed.},
	note = {Includes index.}
}