@book{
international1985iaea,
title={The Role of Isotopes in Studies on Nitrogen Fixation and Nitrogen Cycling by Blue-green Algae and the Azolla-anabaena Azollae Association},
series={TECDOC Series},
number={325},
year={1985},
url={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},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}