Price quality relationships in fodder trading in Niger with special regards to comparison of cowpea and groundnut haulms with concentrates, collected shrubs and grasses - Jarial, Sapna; Blümmel, Michael; Soumana, I.; Prasad, Kodukula V.S.V.; Issa, S.; Ravi, D. (International Crops Research Institute for the Semi-Arid Tropics, 2016)