@book{158252,
	author = {Lipschutz, Seymour and Lipson, Marc Lars},
	title = {Discrete Mathematics /},
	publisher = {McGraw Hill Education},
	year = {2006},
	series = {Schaum's outlines series},
	address = {New Delhi},
	edition = {2nd ed.},
	note = {Includes  index.}
}