@article{11807,
      author       = "Landau, Herbert and Eissfeller, Bernd and Hein, Günter W.",
      title        = "GPS Research 1985 at the Institute of Astronomical and
                      Physical Geodesy  ",
      year         = "1986",
      note         = "Obr., tab. a grafy v textu, 1 sv.",
}