@PROCEEDINGS {EZUMAH:1980c, title = {Cassava planting systems in Africa}, author = {Ezumah, H. C. and Okigbo, B. }, booktitle = {Cassava cultural practices: proceedings of Workshop held in Salvador, Bahia, Brazil, 18-21 March, 1980}, year = {1980}, pages = {44--49}, note = {RTB; Root and Tuber; Cassava.; 44-49 pp.}, }