@book{20211,
	author = {Nathanson, Melvyn B. and ebrary, Inc.},
	title = {Elementary methods in number theory},
	publisher = {Springer,},
	year = {c 2000.},
	series = {Graduate texts in mathematics ;},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10002185}
}