@Article{tvcg08-flowcharts,
  author = {Li, G.-S.  and Tricoche, X. and Weiskopf, D. and Hansen, C.},
  title  = {{Flow Charts: Visualization of Vector Fields on Arbitrary Surfaces}},
  year   = {2008},
  pages  = {1067--1080},
  journal = {IEEE Transactions on Visualization and Computer Graphics},
  volume = {14},
  number = {5}
}