@article{27899,
      author       = "Bybee, J.E. and Chapelle, W.E. and White, J.M. and XIII.
                      Congress of the International Society for Photogrammetry,
                      Helsinki, 1976. Commission II",
      title        = "The RPIE Orthoprinter  ",
      year         = "1976",
      note         = "1 sv.",
}