@ARTICLE {OKIKE:2004, title = {Factors affecting farm-specific production efficiency in the savanna zones of West Africa}, author = {Okike, I. and Jabbar, M. and Manyong, V. and Smith, J. and Ehiu, S. }, journal = {Journal of African Economies}, year = {2004}, volume = {13}, number = {1}, pages = {134--165}, }