@Article{SCI:Kno2009a,
  author =    "A. Knoll and I. Wald and C.D. Hansen",
  title =     "Coherent Multiresolution Isosurface Ray Tracing",
  journal =   "The Visual Computer",
  volume =    "25",
  number =    "3",
  pages =     "209--225",
  year =      "2009",
  url =       "http://www.sci.utah.edu/publications/knoll08/cohoctiso.pdf",
}