@article{21378,
      author       = "Schmid, Helmut H. and IUGG - IAG 15th General Assembly
                      Moscow, 1 - 14 August 1971",
      title        = "On the use of the right Ascension - declination system to
                      establish a three - dimensional geodetic reference system  ",
      year         = "1971",
      note         = "1 sv.",
}