@book{118236,
	author = {L�e, H�ai Ch�au. and Le, Hai Khoi. and ebrary, Inc.},
	title = {Selected problems of the Vietnamese Mathematical Olympiad (1962-2009)},
	publisher = {World Scientific,},
	year = {2010.},
	series = {Mathematical Olympiad series,},
	address = {Singapore ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10480169}
}