@INPROCEEDINGS {DIXON:1993, title = {Progress in cassava and yam improvement in Africa: where do we stand?}, author = {Dixon, A. and Asiedu, R. and Ekanayake, I. J. and Porto, M. C. M. }, booktitle = {Proceeding of International Root Crops Conference, Nov. 6-9, 1993, Trivandrum, India}, year = {1993}, note = {RTB; Root and Tuber; Cassava; Yam}, }