@book{23806,
	author = {Rosen, Kenneth H},
	title = {Discrete mathematics and its applications},
	publisher = {McGraw Hill},
	year = {2007},
	address = {New York},
	edition = {6},
	url = {https://libgen.is/book/index.php?md5=4F3D2B4C5FBC8A87634E07B00268E165}
}