@Article{SCI:Li2008a,
  author =    "G.-S. Li and X. Tricoche and D. Weiskopf and C.D.
              Hansen",
  title =     "Flow Charts: Visualization of Vector Fields on
              Arbitrary Surfaces",
  journal =   "IEEE Transactions on Visualization and Computer
              Graphics",
  volume =    "14",
  number =    "5",
  pages =     "1--14",
  year =      "2008",
  month =     "September/October",
  url =       "http://www.sci.utah.edu/publications/li08/flowcharts.pdf",
}