@book{
      international1999iaea,
      title={IPPAS Guidelines 
Reference document for the IAEA International Physical Protection Advisory Service},
      author={ },
      series={entity},
      number={3 },
      year={1999},
      isbn={ },
      url={/publications/4614/ippas-guidelines-reference-document-for-the-iaea-international-physical-protection-advisory-service },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }