@ARTICLE {NDUBUISI:1998, title = {Crop–livestock integration along the gradient of resource-use intensification in the northern Guinea savanna of Nigeria}, author = {Ndubuisi, A. and Zeddies, J. and Manyong, V. and Smith, J. }, journal = {Quarterly Journal of International Agriculture}, year = {1998}, volume = {37}, pages = {105--115}, }