@book{
      international1991iaea,
      title={Nature and Magnitude of the Problem of Spent Radiation Sources},
      author={ },
      series={entity},
      number={620 },
      year={1991},
      isbn={ },
      url={/publications/876/nature-and-magnitude-of-the-problem-of-spent-radiation-sources },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }