@article{6938,
      author       = "Gürkan, Onur and XVIII General Assembly IUGG, Hamburg, 15
                      - 27 August, 1983",
      title        = "Differential Relations between Earth Fixed Coordinate
                      Systems  ",
      year         = "1983",
      note         = "Obr. v textu. - Liter., 1 sv.",
}