@ARTICLE {AJEIGBE:2010a, title = {On-farm evaluation of improved cowpea-cereals cropping systems for crop-livestock farmers: cereals-cowpea systems in Sudan savanna zone of Nigeria}, author = {Ajeigbe, H. and Singh, B. B. and Ezeaku, I. and Adeosun, J. O. *}, journal = {African Journal of Agricultural Research}, year = {2010}, volume = {5}, number = {17}, pages = {2297--2304}, issn = {1991-637X}, }