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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
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
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