@book{
  international1960iaea,
  title={Large Radiation Sources in Industry},
  series={Proceedings Series},
  year={1960},
  isbn={92-0-060160-X},
  url={https://www.iaea.org/publications/1480/large-radiation-sources-in-industry},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}