@book{5357,
	title = {Variational methods in economics},
	publisher = {North-Holland Pub. Co.;},
	year = {1971. },
	address = {Amsterdam,},
	note = {"Sole distributors for the U.S.A.: American Elsevier, New York, N.Y." },
	url = {http://catalog.hathitrust.org/api/volumes/oclc/216393.html}
}