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Williams, T O and Fernández-Rivera, S and Kelley, T G (1997) The Influence of Socioeconomic Factors on the Availability and Utilization of Crop Residues as Animal Feeds. In: Crop Residues in Sustainable Mixed Crop/Livestock Farming Systems. CAB International in association with the ICRISAT and ILRI, Oxon. ISBN 0851991777