@book{87109,
	author = {Guerrero González, Cesar.},
	title = {Evaluación agrotécnica de la rastra de discos excéntrica modelo international 175/20},
	publisher = {El autor,},
	year = {2003.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/98626.pdf}
}