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Sahrawat, K L and Jones, M P and Diatta, S (1998) Plant phosphorus and rice yield in an Ultisol of the humid forest zone in West Africa. Communications in Soil Science and Plant Analysis, 29 (7-8). pp. 997-1005. ISSN 0010-3624
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
Russell, D A and Singh, J and Jadhav, D R and Surulivelu, T and Regupathi, A and Kranthi, K R (1998) Management of Insecticide Resistant Helicoverpa armigera Lepidoptera: Noctuidae) in Cotton in India. In: Proceeding of the World Cotton Research Conference, 6-12 Sept 1998, Athens, Greece.