@book{89366,
	author = {Dávila Zetina, Porfirio. and López Jiménez, Gildardo.},
	title = {Principales características de la porcicultura mexicana /},
	publisher = {El autor,},
	year = {2004.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/100894.pdf}
}