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