Biological nitrogen fixation and sustainability of tropical agriculture : proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture (IITA), Ibaldan, Nigeria, 24-28 September 1990 /
African Association for Biological Nitrogen Fixation.International Conference(4th :1990 :Ibadan, Nigeria)
Mulongoy, K.
Gueye, M.
Spencer, D. S. C.
Chichester : Wiley,
c1992.