@InCollection{SCI:Kni2005a,
  author =    "J.M. Kniss and G. Kindlmann and C.D. Hansen",
  title =     "Multidimentional Transfer Functions for Volume
              Rendering",
  booktitle = "The Visualization Handbook",
  pages =     "189--210",
  year =      "2005",
  editor =    "C.D. Hansen and C.R. Johnson",
  publisher = "Elsevier",
  isbn =      "0-12-387582-X",
  keywords =  "ncrr, volume rendering, transfer functions",
  url =       "http://www.sci.utah.edu/publications/jmk05/ch09_kniss.pdf",
}