@INBOOK {MANYONG:1997a, title = {Geographic definition of risk for maize production in West Africa: A socio-economic perspective}, author = {Manyong, V. and Oyewole, B. }, editor = {Ransom, J. K. and Palmer, A. and Zambezi, B. T. and Mduruma, Z. O. and Waddington, S. and Pixley, K. and Jewell, D. C. }, year = {1997}, type = {Maize productivity gains through research and technology dissemination: 5th Eastern and Southern Africa Regional Maize Conference, 3-7 June, 1996, Arusha, Tanzania}, pages = {130--134}, publisher = {CIMMYT}, address = {Addis Ababa, Ethiopia}, }