@book{37219,
	author = {Alsina, Claudi. and Nelsen, Roger B. and Mathematical Association of America.},
	title = {Charming proofs},
	publisher = {Mathematical Association of America,},
	year = {c2010.},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10728518}
}