@ARTICLE {SMITH:1997, title = {Integrated crop-livestock systems in sub-Saharan Africa: an option or imperative?}, author = {Smith, J. and Naazie, A. and Larbi, A. and Agyemang, K. and Tarawali, S. }, journal = {Outlook on Agriculture}, year = {1997}, volume = {26}, pages = {237--246}, }