@article{211,
      author       = "Grafarend, E. W. and Schaffrin, B. and University Stuttgart
                      and 19. IUGG - Vancouver, Aug. 9-22, 1987",
      title        = "A comparative study of geodetic inertial systems  ",
      year         = "1987",
      note         = "11 obr. - Liter., 1 sv.",
}