@book{64903,
	author = {Williams, H. P. and ebrary, Inc.},
	title = {Model building in mathematical programming},
	publisher = {Wiley,},
	year = {2013.},
	address = {Hoboken, N.J. :},
	edition = {5th ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10657847}
}