@ARTICLE {NDUBUISI:2000, title = {Economic analysis of crop-livestock integration in the northern Guinea savannah of Nigeria}, author = {Ndubuisi, A. and Zeddies, J. and Manyong, V. and Smith, J. }, journal = {Der Tropenland, Beitrage zur tropischen Landwirtschaft und Veterinarmedizin}, year = {2000}, volume = {101}, pages = {69--83}, }