@INPROCEEDINGS {OKIGBO:1987b, title = {Perceptions of farming systems research towards sustained agricultural yield production}, author = {Okigbo, B. }, editor = {Amoaka-Atta, B. }, booktitle = {Subsistence Agriculture in Africa: Problems and Prospects. Proceedings of the 6th African Association of Insect Scientists (AAIS) Conference, Monrovia}, year = {1987}, pages = {248--258}, organization = {African Bioscience Network/Unesco}, }