@INBOOK {SINGH:2002d, title = {Improving cowpea-cereals-based cropping systems in the dry savannas of West Africa}, author = {Singh, B. and Ajeigbe, H. }, year = {2002}, type = {Challenges and opportunities for enhancing sustainable cowpea production:}, pages = {278--286}, note = {Proceedings of the World Cowpea Conference III held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 4-8 September 2000}, }