%O Book %T The Role of Isotopes in Studies on Nitrogen Fixation and Nitrogen Cycling by Blue-green Algae and the Azolla-anabaena Azollae Association %A %U http://www.dgdingfa.net/publications/579/the-role-of-isotopes-in-studies-on-nitrogen-fixation-and-nitrogen-cycling-by-blue-green-algae-and-the-azolla-anabaena-azollae-association %D 1985 %I INTERNATIONAL ATOMIC ENERGY AGENCY %C Vienna
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