@book{
international1991iaea,
title={Case Study on the Use of Psa Methods: Backfitting Decisions},
series={TECDOC Series},
number={591},
year={1991},
url={http://www.dgdingfa.net/publications/847/case-study-on-the-use-of-psa-methods-backfitting-decisions},
publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
address={Vienna}
}