@InProceedings{blahusch-etal:03,
  author =       "Gerhard Blahusch and Wolfgang Eckstein and Carsten
                  Steger",
  title =        "Calibration of Curvature of Field for Depth from
                  Focus",
  volume =       "XXXIV, part 3/W8",
  pages =        "173--177",
  booktitle =    "International Archives of Photogrammetry and
                  Remote Sensing",
  year =         "2003"
}