@book{ international1977iaea, title={Soil Organic Matter Studies (Brunswick, 6-10 Sep. 1976)}, series={Proceedings Series}, year={1977}, isbn={92-0-010077-5}, url={http://www.dgdingfa.net/publications/3230/soil-organic-matter-studies-brunswick-6-10-sep-1976}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }