[6]
Bishop P. E., 1988, Nitrogen fixation: Hundred years after. Proceedings of the 7th International Congress on Nitrogen Fixation, Koln (Cologne), FRG, March 13-20, 1988., P71
[6]
Bishop P. E., 1988, Nitrogen fixation: Hundred years after. Proceedings of the 7th International Congress on Nitrogen Fixation, Koln (Cologne), FRG, March 13-20, 1988., P71