@book{142209,
	author = {Xu, Jiagu. and ebrary, Inc.},
	title = {Lecture notes on Mathematical Olympiad courses},
	publisher = {World Scientific,},
	year = {2010.},
	series = {Mathematical Olympiad series,},
	address = {Singapore :},
	note = {Includes index.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10422656}
}