@article{438,
      author       = "Katzarski, Ivan S. and Antonov, Diko G. and XIII. Congress
                      of the International Society for Photogrammetry, Helsinki,
                      1976. Commission III",
      title        = "A Program for Semi-Analytical Aerial Triangulation  ",
      year         = "1976",
      note         = "1 sv.",
}