@article{10177,
      author       = "20th General Assembly of the IUGG, 11 - 24 August 1991,
                      Vienna",
      title        = "General Assembly IUGG, 20. Vienna, 11-24 August, 1991. IAG.
                      Program and Abstracts  ",
      year         = "1991",
      note         = "Liter.",
}