@article{21321,
      author       = "Kilpelä, E. and XIIth Congress of the International
                      Society of Photogrammetry in Ottawa 1972",
      title        = "On the Effect of Some Error Sources in Bundle Adjustment  ",
      year         = "1972",
      note         = "1 sv., 7 obr., 3 tab., Preprinted from the Photogrammetric
                      Journal of Finland, Vol. 6/1972, No. 1, S. 31 - 54",
}