@InProceedings{SCI:Gri2007a,
  author =    "C.P. Gribble and S.G. Parker",
  title =     "Interactive Visualization with Advanced Shading
              Models using Lazy Evaluation",
  booktitle = "Proceedings of the 2007 Eurographics Symposium on
              Parallel Graphics and Visualization",
  pages =     "37--44",
  year =      "2007",
  keywords =  "interactive rt distributed interactive ray tracing
              dirt, rtcenter",
}