@book{70073,
	author = {Cereals Workshop ( and Centro Internacional de Mejoramiento de Maíz y Trigo.},
	title = {The gap between present farm yield and the potential},
	publisher = {Ministerie de l' Agriculture et de la Revolution Agraire,},
	year = {[1980?]},
	address = {Algiers :},
	note = {La biblioteca tiene : v.2}
}