@book{
      international1971iaea,
      title={Nitrogen-15 in Soil–plant Studies},
      author={ },
      series={entity},
      number={ },
      year={1971},
      isbn={92-0-111171-1 },
      url={/publications/3016/nitrogen-15-in-soil-plant-studies },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }