@article{445,
      author       = "Powell, C. and 8 th International Congress for
                      Photogrammetry, Stockholm, July 1956",
      title        = "A radio aid to air survey. A paper to be submitted to the 8
                      th International Congress for Photogrammetry, Stockholm,
                      July 1956  ",
      year         = "1956",
      note         = "1 sv.",
}