@book{9515,
	author = {NATO Advanced Study Institute, Univ. of British Columbia, Vancouver, Canada, Aug. 4-15, 1980 and Schaible, Siegfried ; ed.},
	title = {Generalized concavity in optimization and economics; papers presented at the proceedings},
	publisher = {Academic Press},
	year = {1981},
	address = {New York}
}