@article{27244,
      author       = "Andersen, Einar and 12th General Assembly of the
                      International Geodetic and Geophysical Union, 1960,
                      Helsinki",
      title        = "Report on levelling of high precision in the period 1957 -
                      1959  ",
      year         = "1960",
      note         = "Darem, ÚSGK 23.5.1962. - 1 sv.",
}