@article{13699,
      author       = "Ottoson, Lars and 8th International Congress of
                      Photogrammetry, Stockholm, 1956",
      title        = "Investigation of some systematic deformations of the
                      pencils of rays in a stereoplanigraph  ",
      year         = "1956",
      note         = "1 sv., Cummunication of the Commission II., Zvl. ot. z
                      čas.:Svensk Lantmäteritidskrift, 1956, Congress Number",
}