@book{
      international2003iaea,
      title={Guidelines for the Use of Isotopes of Sulfur in Soil–Plant Studies},
      author={ },
      series={entity},
      number={20 },
      year={2003},
      isbn={ },
      url={/publications/6812/guidelines-for-the-use-of-isotopes-of-sulfur-in-soil-plant-studies },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }