@book{99,
	author = {Winston, Wayne L.},
	title = {Operations research},
	publisher = {Duxbury Press},
	year = {1994.},
	address = {Belmont, Calif.},
	note = {System requirements for computer disks: IBM-compatible PC with 386 microprocessor (nonlinear LINGO program requires math coprocessor); PC-DOS.}
}