@article{13489,
      author       = "Gross, P. A. and Ashkenazi, V. and IAG Symposium on
                      Optimisation of Design and Computation of Control Networks.
                      Sopron, 1997",
      title        = "Internal Consistency of National Geodetic Control Networks 
                      ",
      year         = "1977",
      note         = "199500290 ",
}