@INBOOK {EZUMAH:1983b, title = {Possible roles of farming systems research in reducing food production constraints of Rwanda}, author = {Ezumah, H. C. and Balasubramanian, V. }, year = {1983}, type = {In Agricultural Research in Rwanda: Assesment and Perspectives. ed.M.J. Chang, Goverment of Rwanda and ISNAR}, pages = {77--82}, }