@book{89287,
	author = {Cortez Trejo, Ilda.},
	title = {Síntomas foliares de deficiencias de P, K, Ca y Mg en aguacatero cv. Hass (Persea amiericana Mill) /},
	publisher = {El autor,},
	year = {2004.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/100815.pdf}
}