@InProceedings{SCI:Wal2015a,
  author =    "I. Wald and A. Knoll and G. P. Johnson and W.
              Usher and V. Pascucci and M. E. Papka",
  title =     "CPU Ray Tracing Large Particle Data with Balanced
              P-k-d Trees",
  booktitle = "2015 IEEE Scientific Visualization Conference",
  year =      "2015",
  publisher = "IEEE",
  month =     "Oct",
  url =       "http://www.sci.utah.edu/publications/Wal2015a/ospParticle.pdf",
}