@book{6307,
	author = {Straszewicz, S.},
	title = {Mathematical problems and puzzles :},
	publisher = {Pergamon Press,},
	year = {1965.},
	series = {Popular lectures in mathematics ;},
	address = {Oxford ;},
	edition = {1st English ed.},
	note = {Translation of Zadania z olimpiad matematycznych.}
}