@book{54518,
	author = {Burkard, Rainer E. and Dell’Amico, Mauro.},
	title = {Assignment problems /},
	publisher = {SIAM, Society for Industrial and Applied Mathematics,},
	year = {c2009},
	address = {Philadelphia :},
	url = {http://www.loc.gov/catdir/enhancements/fy0913/2008032587-d.html}
}