@book{
      international1981iaea,
      title={International Centre for Theoretical Physics: Scientific Activities in 1980},
      author={ },
      series={entity},
      number={253 },
      year={1981},
      isbn={ },
      url={/publications/504/international-centre-for-theoretical-physics-scientific-activities-in-1980 },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }