@article{29791,
      author       = "Hallert, Bertil and 8th International Congress of
                      Photogrammetry, Stockholm, 1956",
      title        = "Some remarks concerning the theory of errors for convergent
                      aerial pictures in comparison with near vertical pictures  ",
      year         = "1955",
      note         = "1 sv., Communication of the Commission II. Zvl. ot. z
                      čas.: Photogrammetric Engineering, 1954, s. 749 - 757",
}