@INPROCEEDINGS{PoRu95,
  author = {Polthier, K. and Rumpf, M.},
  title = {A Concept for time-dependent processes},
  booktitle = {Scientific Visualization},
  year = {1995},
  editor = {M. G{\"{o}}bel and H. M{\"{u}}ller and B. Urban},
  publisher = {Springer},
  pdf = {http://numod.ins.uni-bonn.de/research/papers/public/PoRu95.pdf}
}