@book{86399,
	author = {White, Jeffrey W. and Grace, Peter R.},
	title = {Directions in modeling wheat and maize for developing countries :},
	publisher = {Centro Internacional de Mejoramiento de Maiz y Trigo,},
	year = {2001.},
	series = {Geographic information systems. Series 01-02},
	address = {México, D.F. :}
}