@book{
      international2019iaea,
      title={SSDL Newsletter Issue No. 69, April 2019},
      author={ },
      series={entity},
      number={69 },
      year={2019},
      isbn={ },
      url={/publications/13549/ssdl-newsletter-issue-no-69-april-2019 },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }