@TechReport{SCI:Kno2006a,
  author =    "A. Knoll and I. Wald and S.G. Parker and C.D.
              Hansen",
  title =     "Interactive Isosurface Ray Tracing of Large Octree
              Volumes",
  number =    "UUSCI-2006-026",
  year =      "2006",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  keywords =  "interactive rt distributed interactive ray
              tracing, octree, rtcenter",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2006-026.pdf",
}