@book{
  international2003iaea,
  title={Categorization of Radioactive Sources},
  series={TECDOC Series},
  number={1344},
  year={2003},
  isbn={92-0-105903-5},
  url={https://www.iaea.org/publications/6808/categorization-of-radioactive-sources},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}