@InProceedings{SCI:Gri2006c,
  author =    "C.P. Gribble and S.G. Parker",
  title =     "Enhancing Interactive Particle Visualization with
              Advanced Shading Models",
  booktitle = "Proceedings of the {ACM} Siggraph Third Symposium
              on Applied Perception in Graphics and
              Visualization",
  pages =     "111--118",
  year =      "2006",
  keywords =  "mpm material point method, rtrt real-time ray
              tracing, csafe c-safe, rtcenter",
  url =       "http://www.sci.utah.edu/publications/Gri2006c/plt-apgv06.pdf",
}