@article{21335,
      author       = "Schmid, Hellmut H. and Symposium on Aerial Triangulation
                      International Society for Photogrammetry, London, England,
                      August 9 - 13, 1971",
      title        = "On the Influence of Systematic Errors in the Least Squares
                      Treatment of Photogrammetric Data  ",
      year         = "1971",
      note         = "1 seš., Commission III",
}