@INBOOK {ALENE:2015, title = {The effectiveness of crop improvement programmes from the perspectives of varietal output and adoption: cassava, cowpea, soybean and yam in sub-Saharan Africa and maize in West and Central Africa}, author = {Alene, A. and Abdoulaye, T. and Rusike, J. * and Manyong, V. and Walker, T. S. }, editor = {Walker, T. S. and Alwang, J. }, year = {2015}, pages = {74--122}, chapter = {6}, publisher = {CGIAR and CABI}, address = {Montpellier, France and Oxfordshire, UK}, isbn = {978 1 78064 401 1}, note = {In: Crop improvement, adoption, and impact of improved varieties in food crops in sub-Saharan Africa, edited by Walker, T.S., Alwang, J.; SAHub; WAHub; EAHub; RTB; Cassava; Yam; CRP Grain Legumes; Cowpea; Soybean; CRP Maize; Maize}, }