@book{64624,
	author = {Shell, Karl.},
	title = {Essays on the theory of optimal economic growth.},
	publisher = {M.I.T. Press},
	year = {[1967]},
	address = {Cambridge, Mass.},
	note = {Fifteen essays, based upon material that was presented during 1965-66 at an M.I.T. seminar.}
}