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Singh, B. ,  [Successful farmer to farmer diffusion of improved cowpea seeds in northern Nigeria] ,  Successful farmer to farmer diffusion of improved cowpea seeds in northern Nigeria

Emechebe, A. ,  Singh, B. ,  [Technology options and research challenges to increase cowpea production under Striga and drought stress in semiarid Africa] ,  Technology options and research challenges to increase cowpea production under Striga and drought stress in semiarid Africa