@Article{SCI:Tie2009a,
  author =    "J. Tierny and A. Gyulassy and E. Simon and V.
              Pascucci",
  title =     "Loop Surgery for Volumetric Meshes: Reeb Graphs
              Reduced to Contour Trees",
  journal =   "{IEEE} Transactions on Visualization and Computer
              Graphics, Proceedings of the 2009 {IEEE}
              Visualization Conference",
  volume =    "15",
  number =    "6",
  pages =     "1177--1184",
  year =      "2009",
  month =     "Sept/Oct",
  doi =       "10.1109/TVCG.2009.163",
  url =       "http://www.sci.utah.edu/publications/tierny2009/loop-surgery.pdf",
}