@book{131059,
	author = {Villegas Silva, Luis Miguel.},
	title = {Combinatoria infinita /},
	publisher = {Plaza y Valdés, S.A. de C.V.,},
	year = {2007.},
	address = {México D. F. :},
	note = {Contiene índice.},
	url = {https://elibro.net/ereader/politecnicointernacional/75837}
}