@INPROCEEDINGS {OKIGBO:1987d, title = {Roots and tubers in the African food crisis. (Keynote Address)}, author = {Okigbo, B. }, editor = {Akoroda, M. and Terry, E. R. and Arene, O. B. }, booktitle = {Tropical Root Crops: Root Crops and the African Food Crisis: Proceedings of the Third Triennial Symposium of the ISTRC - Africa Branch}, year = {1987}, pages = {9--20}, organization = {IDRC}, address = {Ottawa}, }