@ARTICLE {HAHN: S.K. 1983, title = {Progress of root and tuber improvement at IITA}, author = {Hahn, S. K. }, journal = {Paper presented at the Sixth Symposium of the International Society for Tropical Root Crops, 21-26 February 1983,CIP,Lima, Peru}, year = {1983}, pages = {21--26}, note = {RTB; Root and Tuber}, }