@Article{SCI:Kni2002a,
  author =    "J.M. Kniss and G. Kindlmann and C.D. Hansen",
  title =     "Multidimensional Transfer Functions for
              Interactive Volume Rendering",
  journal =   j-TVCG,
  volume =    "8",
  number =    "3",
  pages =     "270--285",
  year =      "2002",
  keywords =  "scalar field methods, volume rendering, transfer
              functions, simian, scientific visualization",
  url =       "http://www.sci.utah.edu/publications/jmk02/kniss_tvcg02-small.pdf",
}