@book{23803,
	author = {Rosen, Kenneth H},
	title = {Discrete mathematics and its applications},
	publisher = {McGraw Hill},
	year = {2012},
	address = {New York},
	edition = {7th},
	url = {https://libgen.is/book/index.php?md5=AC7DD870ABDFA161743C9AFBFA84AFD0}
}