@book{62505,
	author = {Hadley, G. and Kemp, Murray C.,},
	title = {Variational methods in economics /},
	publisher = {American Elsevier,},
	year = {1971.},
	address = {New York :},
	note = {"Sole distributors for the U.S.A.: American Elsevier, New York, N.Y."}
}