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Negassa, A. ,  Shapiro, Barry I. ,  Kidane, T. ,  Abdena, A. ,  Hanson, Jean ,  [Ex-ante assessment of demand for improved forage seed and planting materials among smallholder farmers in Ethiopia: A contingent valuation analysis] ,  Ex-ante assessment of demand for improved forage seed and planting materials among smallholder farmers in Ethiopia: A contingent valuation analysis