@inproceedings{RitschelGKS2008,
  author    = {Tobias Ritschel and
               Thorsten Grosch and
               Jan Kautz and
               Hans-Peter Seidel},
  title     = {Interactive global illumination based on coherent surface
               shadow maps},
  booktitle = {Graphics Interface},
  year      = {2008},
  pages     = {185-192}
}