@book{
      international2020iaea,
      title={SSDL Newsletter Issue No. 71, April 2020},
      author={ },
      series={entity},
      number={71 },
      year={2020},
      isbn={ },
      url={/publications/14721/ssdl-newsletter-issue-no-71-april-2020 },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }