@TechReport{SCI:Wal2007d,
  author =    "I. Wald and C. Gribble and S. Boulos and A.
              Kensler",
  title =     "SIMD Ray Stream Tracing - SIMD Ray Traversal with
              Generalized Ray Packets and On-the-fly Re-Ordering
              -",
  number =    "UUSCI-2007-012",
  year =      "2007",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  keywords =  "interactive ray tracing, rtcenter",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2007-012.pdf",
}