@book{78411,
	author = {Kumwenda, John D.T. and Snapp, Sieglinde S.},
	title = {Soil fertility management research for the maize cropping systems of smallholders in Southern Africa :},
	publisher = {Centro Internacional de Mejoramiento de Maíz y Trigo,},
	year = {1996.},
	series = {Documento},
	address = {México, D.F. :}
}