@article{30785,
      author       = "Baarda, W. and Second Internat. Symposium on Geodetic
                      Calculations Brussels, 6th - 11th June, 1966",
      title        = "Statistical Concepts in Geodesy. 2nd part. Chapter 4 Model
                      Theory  ",
      year         = "1966",
      note         = "1 brož.",
}