@article{12676,
      author       = "Meier, H. K. and XIIth Congress of the International
                      Society of Photogrammetry in Ottawa 1972",
      title        = "Improvement of the HLZ Electronic Contourliner for the
                      Gigas-Zeiss Orthoprojector  ",
      year         = "1972",
      note         = "1 sv.",
}