@article{27695,
      author       = "Middel, B. and Schaffrin, B. and Univ. Stuttgart and 19.
                      IUGG - Vancouver, August 9-22, 1987",
      title        = "Robust Determination of the Earth's Gravity Potential
                      Coefficients  ",
      year         = "1987",
      note         = "Obr. v textu. - Liter., 1 sv.",
}