@book{
  international1981iaea,
  title={Protection Systems and Related Features (Heidelberg, 1-5 Sept. 1980)},
  series={Proceedings Series},
  year={1981},
  isbn={92-0-010181-X},
  url={https://www.iaea.org/publications/3396/protection-systems-and-related-features-heidelberg-1-5-sept-1980},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}