@book{125422,
	author = {Jacobs, Konrad. and Jungnickel, Dieter. and ebrary, Inc.},
	title = {Einführung in die Kombinatorik},
	publisher = {W. de Gruyter,},
	year = {2004.},
	address = {Berlin ;},
	edition = {2nd and extended ed.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10194868}
}