@book{226431,
	author = {United States},
	title = {Defending U.S. economic interests in the changing Arctic},
	publisher = {U.S. G.P.O.},
	year = {2012},
	series = {S. hrg.},
	address = {Washington},
	url = {http://purl.fdlp.gov/GPO/gpo19720}
}