@book{2780,
	author = {Killen, James.},
	title = {Mathematical Programming Methods for Geographers and Planners },
	publisher = {ST . MARTIN'S PRESS},
	year = {1983.},
	address = {New York},
	url = {http://www.amazon.com/exec/obidos/ASIN/0312501331/chopaconline-20}
}