@book{
      international1968iaea,
      title={Theory of Condensed Matter (Trieste, 3 Oct. - 18 Dec. 1967)},
      author={ },
      series={entity},
      number={ },
      year={1968},
      isbn={92-0-130068-9 },
      url={/publications/2178/theory-of-condensed-matter-trieste-3-oct-18-dec-1967 },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }