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Rich, Karl M. ,  Spielman, David J. ,  Gardner, J.G. ,  [Interactions, externalities, time and space: implications for agricultural innovation systems research] ,  Interactions, externalities, time and space: implications for agricultural innovation systems research

Haile, Beliyou ,  Azzarri, Carlo ,  Roberts, C. ,  Spielman, David J. ,  [Targeting, bias, and expected impact of complex innovations on developing-country agriculture: Evidence from Malawi] ,  Targeting, bias, and expected impact of complex innovations on developing-country agriculture: Evidence from Malawi