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Yapi, A M and Dehala, G and Ngawar, K and Issaka, A (1999) Assessment of the Economic Impact of Sorghum Variety S 35 in Chad. Documentation. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Hyderabad, Andhra Pradesh.
Yapi, A M and Debrah, S K and Dehala, G and Njomaha, C (1999) Impact of Germplasm Research Spillovers: The Case of Sorghum Variety S 35 in Cameroon and Chad. Documentation. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Hyderabad, Andhra Pradesh.
Yapi, A M and Kergna, A O and Debrah, S K and Sidibe, A and Sanogo, O (2000) Analysis of the Economic Impact of Sorghum and Millet Research in Mali. Documentation. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Hyderabad, Andhra Pradesh.