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Snapp, S S and Silim, S N (2002) Farmer preferences and legume intensification for low nutrient environments. Plant and Soil, 245 (1). pp. 181-192.
Snapp, S S and Mafongoya, P L and Waddington, S (1998) Organic matter technologies for integrated nutrient management in smallholder cropping systems of southern Africa. Agriculture, Ecosystems and Environment, 71 (1-3). pp. 185-200. ISSN 0167-8809