@book{91221,
	author = {Serrano Covarrubias, Luis Manuel.},
	title = {Sistema de investigación del cultivo de frigol en México /},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/102756.pdf}
}