@book{40230,
	author = {Apt, Krzysztof R and Wallace, M.},
	title = {Constraint logic programming using ECLiPSe /},
	publisher = {Cambridge University Press,},
	year = {2007.},
	address = {Cambridge :},
	url = {http://www.loc.gov/catdir/enhancements/fy0729/2007297920-t.html}
}