@book{
      international1990iaea,
      title={International Centre for Theoretical Physics, Trieste: Scientific Activities in 1989},
      author={ },
      series={entity},
      number={575 },
      year={1990},
      isbn={ },
      url={/publications/831/international-centre-for-theoretical-physics-trieste-scientific-activities-in-1989 },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }