@book{1667,
	author = {Ortega Medina, Luciano.},
	title = {Heterosis y efectos genéticos individuales y maternos en bovinos Angus y Suizo pardo},
	publisher = {El autor,},
	year = {1990},
	address = {Chapingo, Méx. :},
	note = {42-192}
}