Cassava production trends in Africa, Nweke, F., Polson, R. and Strauss, J., in: Tropical root crops in a developing economy: proceedings of the 9th Symposium of the International Society for Tropical Root Crops, 20-26 October 1991, Accra, Ghana, pages 311-321, ISTRC; Government of Ghana; International Institute of Tropical Agricultuer (IITA), 1994.