@PROCEEDINGS {OKIGBO:1977, title = {A new method of yam propagation: proceedings of the Third Symposium of the International Society for Tropical Root Crops held at IITA, Ibadan, Nigeria, 2-9 December, 1973}, author = {Okigbo, B. and Ibe, O. J. }, booktitle = {Proceedings of the Third Symposium of the International Society for Tropical Root Crops held at IITA, Ibadan, Nigeria, 2-9 December, 1973}, year = {1977}, month = {December}, }