@inproceedings{109,
  keywords = {sky, luminance, high dynamic range, photography, measurement},
  author = {Axel Jacobs and Stephen Wittkopf and Lars Grobe},
  title = {Per-pixel sky luminance with HDR photography},
  year = {2008},
  journal = {7th International Radiance Workshop CD},
  url = {http://www.radiance-online.org:82/radiance-workshop7/Content/Jacobs/jacobs-fribourg2008d.pdf},
}