S. C. Eze, J. E. Asiegbu, B. N. Mbah, G. C. Orkwor, and R. Asiedu, “The effects of four agrobotanical extracts and three types of bags on the control of insect pests and moulds of stored yam chips”, Agro-Sci., vol. 5, no. 1, Feb. 2007.