@article{532,
      author       = "Raices Vidal, O. J. and IUGG - IAG, 15th General Assembly
                      Moscow, 1 - 14 August 1971",
      title        = "A unified procedure for the Solution of the least Squares
                      problem and for estimating the precision of the adjusted
                      variables  ",
      note         = "1 sv.",
}