@book{297100,
	author = {Vasil΄ev, NIkolaj Borisovič and Savin, Anatolij Pavlovič},
	title = {Izbrannye olimpiadnye zadači. Matematika},
	publisher = {Bûro Kvantum},
	year = {2007},
	series = {Bibliotečka "Kvant"},
	address = {Moskva}
}