@InProceedings{Hertel:2009:HybridGPUAliasFreeHardShadows,
  author =       {Stefan Hertel and Kai Hormann and R\"{u}diger Westermann},
  title =        {A Hybrid GPU Rendering Pipline for Alias-Free Hard Shadows},
  booktitle =    {Proceedings of Eurographics 2009 Area},
  year =         {2009},
}