@ARTICLE {SCHULTHESS:1997b, title = {Multi-trophic interactions in cassava, manihot esculenta, cropping systems in the subhumid tropics of West Africa}, author = {Schulthess, F. and Neuenschwander, P. and Gounou, S. }, journal = {Agriculture, Ecosystems and Environment}, year = {1997}, volume = {66}, pages = {211--222}, }