@book{150942,
	author = {Wells, Dave, and Mathematical Association of America.},
	title = {The contest problem book IX},
	publisher = {Mathematical Association of America,},
	year = {c2008.},
	address = {Washington, D.C. :},
	edition = {1st ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10733081}
}