@article{14034,
      author       = "Birardi, Giuseppe and 20th General Assembly of the IUGG, 11
                      - 24 August 1991, Viena",
      title        = "The Italian North-South GPS Traverse and a proposal for a
                      "first order" Italian geoidal net  ",
      year         = "1991",
      note         = "Abstr. - Liter. - Tab. a obr. v příl.",
}