@INPROCEEDINGS {MULONGOY:1990a, title = {Biological nitrogen fixation and nitrogen transfer in multiple cropping in tropical Africa}, author = {Mulongoy, K. and Ehui, S. K. }, booktitle = {Maximiser la fixation biologique de l'azote pour la production agricole et forestiere en Afrique. Illeme Conference de L'AABNF, 7-12 Nov 1988, Dakar, Senegal, edited by M. Gueye, K. Mulongoy, and Y. Dommergues. Collection Actes de l'ISRA}, year = {1990}, volume = {2}, number = {2}, pages = {174--191}, address = {Dakar, Senegal}, }