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Sanders, J H and Sharpiro, B (2012) Policies and Market Development to Accelerate Technological Change in the Semiarid Zones: A Focus on Sub-Saharan Africa. In: Dryland Agriculture. American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, Madison. Wisconsin, USA, pp. 879-900. ISBN 978-0-89118-265-8