@article{4226,
      author       = "Simonsen, O. and International Union of Geodesy and
                      Geophysics - XII General Assembly Helsinki 25 July - 6
                      August 1960",
      title        = "Closing errors and .. and .. for single lines connection
                      polygons (else separated) from the countries DK + N + S
                      calculated thus (a) by use of the gravity g at ground
                      surface (b) by use of theoretical standard gravity in zero
                      level  ",
      year         = "1960",
      note         = "1 sv., International Association of Geodesy. International
                      Commission for European Levelling, 3 vol. příl. ve spol.
                      obálce",
}