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Bationo, A and Christianson, C B and Baethgen, W E and Mokwunye , A U (1992) A farm-level evaluation of nitrogen and phosphorus fertilizer use and planting density for pearl millet production in Niger. Fertilizer Research, 31 (2). pp. 175-184. ISSN 0167-1731
Bationo, A and Christianson, C B and Klaij, M C (1993) The effect of crop residue and fertilizer use on pearl millet yields in Niger. Fertilizer Research, 34 (3). pp. 251-258. ISSN 0167-1731
Kanwar, J S and Youngdahl, L J (1985) Micronutrient needs of tropical food crops. Fertilizer Research, 7 (1-3). pp. 43-67. ISSN 0167-1731
Moraghan, J T and Rego, T J and Buresh, R J and Vlek,, P L G and Burford, J R and Singh, S and Sahrawat, K L (1984) Labeled nitrogen fertilizer research with urea in the semi-arid tropics. II. Field studies on a Vertisol. Plant and Soil, 80 (1). pp. 21-33. ISSN 0032-079X