@BOOKLET {MANYONG:2000, title = {The contribution of IITA-improved cassava to food security in sub-Saharan Africa: an impact study}, author = {Manyong, V. and Dixon, A. and Makinde, K. and Bokanga, M. and Whyte, J. }, year = {2000}, address = {Ibadan, Nigeria}, howpublished = {Impact series}, note = {RTB; Root and Tuber; Cassava.; 13p.; Impact series}, }