@book{81204,
	author = {Lipschutz, Seymour and Lipson,Marc Lars},
	title = {Discrete mathematics /},
	publisher = {McGraw Hill Education},
	year = {2013},
	series = {Schaum's outlines series},
	address = {New Delhi},
	edition = {3rd rev. ed},
	note = {Includes  index.}
}