@InProceedings{giwgc04-diepstraten,
  author = {Diepstraten, J. and Ertl, T.},
  title  = {{Interactive Rendering of Reflective and Transmissive Surfaces in 3D Toon Shading}},
  year   = {2004},
  booktitle = {{Proceedings of GI Workshop Methoden und Werkzeuge zukuenftiger Computerspiele '04}}
}