@article{248,
      author       = "Keir, K.M. and Mott, P.G. and XIII. Congress of the
                      International Society for Photogrammetry, Helsinki, 1976.
                      Commission II",
      title        = "A Digital Mapping System. Designed for the Commercial Air
                      Survey Market  ",
      year         = "1976",
      note         = "Obr. v textu, 1 sv.",
}