@INBOOK {KORMAWA:2002d, title = {Cowpea demand and supply patterns in West Africa: the case of Nigeria}, author = {Kormawa, P. and Manyong, V. and Chianu, J. }, year = {2002}, type = {Challenges and opportunities for enhancing sustainable cowpea production:}, pages = {376--386}, note = {Proceedings of the World Cowpea Conference III held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 4-8 September 2000}, }