@INPROCEEDINGS{Gait10,
  author = {Athanasios Gaitatzes and Anthousis Andreadis and Georgios Papaioannou and Yiorgos Chrysanthou},
  title = {Fast Approximate Visibility on the GPU Using Precomputed 4D Visibility Fields},
  BOOKTITLE =    {Proc. 18th International Conference on Computer Graphics, Visualization and Computer Vision (WSCG 2010)},
  YEAR =         {2010},
  pages =        {131 -- 138},
  month =        {Feb},
}