@ARTICLE {CHIANU:2007, title = {Crop-livestock interaction in the savannas of Nigeria: nature and determinants of farmer decision to use manure for soil fertility maintenance}, author = {Chianu, J. and Tsujii, H. and Manyong, V. }, journal = {Journal of Food, Agriculture and Environment}, year = {2007}, volume = {5}, number = {2}, pages = {295--301}, }