@article{33332,
      author       = "Gamper, C. and Hofmann-Wellenhof, B. and Kienast, G. and
                      20th General Assembly of the IUGG, 11 - 24 August 1991,
                      Viena",
      title        = "Theoretical and Practical Results Using a Local
                      Positionning System  ",
      year         = "1991",
      note         = "Abstr. - Liter. - 3 obr.",
}