@book{91866,
	author = {Ortíz Pérez, Ramón.},
	title = {Caracterización del Tejocote (Crataegus spp.) mediante caracteres morfológicos de flor /},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/103404.pdf}
}