@TechReport{SCI:Ben2007a,
  author =    "C. Benthin and S. Boulos and D. Lacewell and I.
              Wald",
  title =     "Packet-based Ray Tracing of Catmull-Clark
              Subdivision Surfaces",
  number =    "UUSCI-2007-011",
  year =      "2007",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  keywords =  "interactive rt distributed interactive ray tracing
              dirt, rtcenter",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2007-011.pdf",
}