@book{26386,
	author = {Rosen, Kenneth H.},
	title = {Discrete mathematics and its applications /},
	publisher = {McGraw-Hill Higher Education,},
	year = {c2007.},
	address = {Boston :},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0612/2006012468.html}
}