@Article{WaldHavran:2006:RT06,
  author =    "Ingo Wald and Vlastimil Havran",
  title =     "On building fast kd-trees for ray tracing, and on doing that in O(N log N)",
  booktitle = "Proceedings of IEEE Symposium on Interactive Ray Tracing 2006",
  date =      "18-20",
  year =      "2006",
  month =     Sep,
  pages =     "61--69",
  keywords =  "ray shooting, ray tracing, animation, spatial subdivision,
               hierarchical data structures, spatial sorting, approximate algorithms",
  editors = "Ingo Wald and Steven G. Parker",
}