@BOOK {NWEKE:1992a, title = {Elasticities of demand for major food items in a root and tuber-based food system: emphasis on yam and cassava in Southeastern Nigeria: RCMP Research monograph, No. 11}, author = {Nweke, F. and Okorji, E. C. and Njoku, J. E. * and King, D. J. }, series = {RCMP Research monograph, No. 11}, year = {1992}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {RTB; Root and Tuber.; 21p.}, }