@INPROCEEDINGS {MANYONG:2000b, title = {Economic evaluation of systems intercropping food crops with leguminous cover crops in the derived savanna of Nigeria}, author = {Manyong, V. and Tian, G. and Makinde, K. and Kolawole, G. }, booktitle = {Cover crops for natural resource management in West Africa = Plantes de couverture et gestion des ressources naturelles en Afrique occidentale: proceedings of a workshop organized by IITA and CIEPCA, Cotonou, Benin, 26-29 October 1999. Ibadan, Nigeria}, year = {2000}, pages = {95--106}, }