@ARTICLE {EZUMAH:1990b, title = {Cassava and maize intercropping system: the effects of varieties and plant populations}, author = {Ezumah, H. C. and Lawson, T. L. }, journal = {Journal of Agronomy and Crop Science}, year = {1990}, volume = {164}, pages = {334--342}, note = {RTB; Root and Tuber; Cassava}, }