@article{19013,
      author       = "Schädlich, M. and IUGG - IAG, 15th General Assembly
                      MOscow, 1 - 14 August 1971",
      title        = "Modeltheory and the technique of Geodetic Measurements -
                      general Conception of the theory of Measurements  ",
      year         = "1971",
      note         = "1 sv.",
}