@book{2759,
	author = {Peña Sosa, Omar.},
	title = {Control químico de la mancha púrpura de la cebolla Alternaria porri (Ellis) CIF. en Tulantongo Texcoco, México},
	publisher = {El autor,},
	year = {1991},
	address = {Chapingo, Méx. :},
	note = {D47-51}
}