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Chien, S H and Henao, J and Christianson, C B and Bationo, A and Mokwunye, A U (1990) Agronomic evaluation of two unacidulated and partially acidulated phosphate rocks indigenous to Niger. Soil Science Society of America Journal, 54 (6). pp. 1772-1777. ISSN 0361-5995
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