@Article{SCI:Web2007b,
  author =    "G.H. Weber and S.E. Dillard and H. Carr and V.
              Pascucci and B. Hamann",
  title =     "Topology-controlled volume rendering",
  journal =   "IEEE Transactions on Visualization and Computer
              Graphics",
  volume =    "13",
  number =    "2",
  pages =     "330--341",
  year =      "2007",
  month =     "January",
}