@ARTICLE {IKEORGU:1989, title = {Productivity of species in cassava/maize/okra/egusi melon complex mixtures in Nigeria}, author = {Ikeorgu, J. * and Ezumah, H. C. and Wahua, T. A. T. *}, journal = {Field Crops Research}, year = {1989}, volume = {21}, number = {1}, pages = {1--7}, note = {RTB; Root and Tuber; Cassava}, }