@book{2187,
	author = {Herrera Zamarrón, Guadalupe.},
	title = {Interacción infra e interespecífica entre frijol y maíz (Phaseolus vulgaris L. y Zea mays L.)},
	publisher = {El Autor,},
	year = {1991},
	address = {Montecillo, Méx. :},
	note = {D44-221}
}