@book{4093,
	author = {Lipschutz, Seymour. and Lipson, Marc Lars },
	title = {Discrete mathematics /},
	publisher = {Tata McGraw-Hill,},
	year = {c1997 [Reprinted 2010].},
	series = {Schaum's outlines.},
	address = {New Delhi :},
	edition = {3rd ed.}
}