@article{6097,
      author       = "Halonen, R.S. and Härmälä, Seppo and XIII. Congress of
                      the International Society for Photogrammetry, Helsinki,
                      1976. Commission VI",
      title        = "The Developing Countries As an Objective of ISP Activity  ",
      year         = "1976",
      note         = "1 sv.",
}