@article{27273,
      author       = "IUGG XX General Assembly IAG, Vienna, August 11-24, 1991",
      title        = "Report on the Geodetic Activities in the years 1987 to
                      1991. Switzerland. Swiss Geodetic Commission and Federal
                      Office of Topography  ",
      year         = "1991",
      note         = "Tab. a obr. v textu. - Čet. lit.",
}