@Article{grave-eurovis09,
  author = {Grave, F. and Müller, T. and Dachsbacher, C. and Wunner., G.},
  title  = {{The Gödel Engine - An interactive approach to visualization in general relativity}},
  year   = {2009},
  pages  = {807-814},
  journal = {{Computer Graphics Forum}},
  number = {{3}},
  volume = {{28}}
}