@book{562141,
	author = {Hillier.},
	title = {Introduction to operations research, seventh edition /},
	publisher = {McGraw-Hill,},
	year = {2001},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/B001F0T7M6/chopaconline-20}
}