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Nitrogen fixation: hundred years after, Proceedings of the 7th International Congress on N2-fixation, H. Bothe, FJ De Bruijn, WE Newton (Eds.), Cologne, March 13–20, 1988, Gustav Fischer Verlag, Stuttgart, New York (1988), 878 Seiten, 150 Abb., 81 Tabellen, ISBN: 3-437-30587-5