@INPROCEEDINGS{Schumann2007,
  author = {Christian Schumann and Steffen Oeltze and Ragnar Bade and Bernhard Preim},
  title = {Model-free Surface Visualization of Vascular Trees},
  booktitle = {IEEE/Eurographics Symposium on Visualization (EuroVis)},
  year = {2007},
  pages = {283--290}
}