Arega D. Alene, Abebe Menkir, S. O. Ajala, B. Badu-Apraku, A. S. Olanrewaju, V. M. Manyong and Abdou Ndiaye
Agricultural Economics 40 ( 5 ): 535 - 550 , 2009
B. Badu-Apraku, A. Fontem Lum, M.A.B. Fakorede, A. Menkir, Y. Chabi, C. The, M. Abdulai, S. Jacob and S. Agbaje
Crop Science 48 ( 1 ): 99 - 112 , 2008