@TechReport{SCI:Kno2007b,
  author =    "A. Knoll and Y. Hijazi and C.D. Hansen and I. Wald
              and H. Hagen",
  title =     "Interactive Ray Tracing of Arbitrary Implicit
              Functions",
  number =    "UUSCI-2007-002",
  year =      "2007",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  keywords =  "interactive rt distributed interactive ray tracing
              dirt, vacet",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2007-002.pdf",
}