@article{20476,
      author       = "Gleditsch, Kr. and 9th International Congress of
                      Photogrammetry",
      title        = "Norvay. Summary of photogrammetric activity in Norway 1956
                      - 1959. Communication to 9th International Congress of
                      Photogrammetry from Norsk Kartografisk Forening through... 
                      ",
      year         = "1960",
      note         = "1 sv.",
}