@book{78509,
	author = {Rice, Elizabeth. and Blanco, José-Luis.},
	title = {Farmers' use of improved seed selection practices in mexican maize :},
	publisher = {Centro Internacional de Mejoramiento de Maíz y Trigo,},
	year = {1997.},
	series = {Economics. Working paper},
	address = {México, D.F. :}
}