@book{177228,
	author = {United Nations. and United Nations},
	title = { population structure in european countries /},
	publisher = {Department of Economic and Social Affairs, United Nations,},
	year = {1966.},
	series = {Population Studies / United Nations. Dept. of Economic and Social Affairs ;},
	address = {New York :},
	note = {United Nations. Document ST/SOA/Ser. A/31.}
}