@article{40847,
      author       = "Schädlich, M. and Second International Symposium on
                      Geodetic Calculations Brussels, 6th - 11th June, 1966",
      title        = "Zur Fehlertheorie gruppen- und satzweiser
                      Beobachtungsreihen  ",
      year         = "1966",
      note         = "1 seš.",
}