@ARTICLE {NWEKE:1994g, title = {Circumstances of rapid spread of cultivation of improved cassava varieties in Nigeria}, author = {Nweke, F. and Hahn, S. K. and Ugwu, B. }, journal = {Journal of Farming Systems Research-Extension}, year = {1994}, volume = {4}, number = {3}, pages = {93--119}, note = {RTB; Root and Tuber; Cassava}, }