@book{66687,
	author = { Liu,	C L and Mohapatra, Durga Prasad },
	title = {Elements of discrete mathematics : },
	publisher = {Tata McGraw-Hill, },
	year = {2008.},
	series = {McGraw-Hill computer science series.},
	address = {New Delhi :},
	edition = {Special Indian Edition },
	note = {Includes index.}
}