@INPROCEEDINGS {MANYONG:2003e, title = {Economic research at IITA for the improvement of agriculture in the subhumid and humid zones of West Africa}, author = {Manyong, V. }, booktitle = {Economic Analyses of Agricultural technologies and rural institutions in West Africa: achievements, challenges, and application to rice farming research. Proceedings of the JIRCAS International Workshop, 12-13 July 2001}, year = {2003}, organization = {JIRCAS}, location = {Tsukuba, Japan}, }