@book{91126,
	author = {Avila Valdez, José Luis.},
	title = {Estudio econométrico de la demanda de cebolla de 1975 a 2003 /},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/102661.pdf}
}