@article{6947,
      author       = "Mierlo, Jan van and FIG and Meeting of FIG Study Group 5B
                      Survey Control Networks, 7th-9th July 1982, Aalborg",
      title        = "Difficulties in Defining the Quality of Geodetic Networks 
                      ",
      year         = "1982",
      note         = "Liter., 1 sv.",
}