@book{1216,
	author = {Nemhauser, George and Wolsey, Laurence},
	title = {Integer and combinatorial optimization},
	publisher = {John Wiley & Sons,},
	year = {1988},
	address = {New York, USA :},
	url = {https://itmsp.museknowledge.com/UOH?qurl=https://libros-uoh.uoh.cl//ebook_3/integer-and-combinatorial-optimization/}
}