@book{16935,
	author = {Conference on "Constructive Approaches to Mathematical Models", Pittsburgh, Pennsylvania, 10-14 July, 1978 and Coffman, C. V. ; ed.},
	title = {Constructive approaches to mathematical models; proceedings of a conference in honor of R. J. Duffin},
	publisher = {Academic Press},
	year = {1979},
	address = {New York}
}