@TechReport{SCI:Mey2005a,
  author =    "M.D. Meyer and H. Pfister and C.D. Hansen and C.R.
              Johnson",
  title =     "Image-Based Volume Rendering with Opacity Light
              Fields",
  number =    "UUSCI-2005-002",
  year =      "2005",
  institution = "University of Utah",
  type =      "{SCI} Institute Technical Report",
  keywords =  "scalar field methods, volume rendering, image
              based volume rendering ibvr",
  url =       "http://www.sci.utah.edu/publications/SCITechReports/UUSCI-2005-002.pdf",
}