@InProceedings{wscg02-diepstraten,
  author = {Diepstraten, J. and Weiskopf, D. and Ertl, T.},
  title  = {{Automatic Generation and Non-Photorealistic Rendering of 2+1D Minkowski Diagrams}},
  year   = {2002},
  pages  = {139-147},
  booktitle = {{Proc. WSCG '02}}
}