@book{219462,
	author = {Serna Huescas, Ignacio Edgar and Treviño Siller, Elida Estela},
	title = {Demanda de fertilizantes en México:},
	publisher = {El autor,},
	year = {1988.},
	address = {Chapingo, México :},
	url = {http://10.13.5.2/tesis/tl/17904_SERNA_HUESCAS_IGNACIOEDGAR.pdf}
}