@Article{SCI:Tri2006a,
  author =    "X. Tricoche and X. Zheng and A. Pang",
  title =     "Visualizing the Topology of Symmetric,
              Second-Order, Time-varying Two-Dimensional Tensor
              Fields",
  journal =   "Visualization and Processing of Tensor Fields",
  pages =     "225--240",
  year =      "2006",
  publisher = "Springer",
}