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