@ARTICLE {OJIAKO:2007a, title = {Analysis of production trends in the major root and tuber crops in Nigeria, 1961-2005}, author = {Ojiako, I. A. and Asumugha, G. * and Ezedinma, C. and Uzokwe, V. N. E. }, journal = {Research on Crops}, year = {2007}, volume = {8}, number = {2}, pages = {371--380}, issn = {0972-3226}, note = {RTB}, }