@article{21354,
      author       = "Wassef, M. A. and International Society of Photogrammetry
                      the Ninth International Congress of Photogrammetry London
                      1960",
      title        = "On the Problem of Relative Orientation in Mountainous
                      Regions  ",
      year         = "1960",
      note         = "United Arab Republic., 1 sv.",
}