@InProceedings{GH2001,
  author = {Engel,K. and Kraus,M. and Ertl,T.},
  title  = {{High-Quality Pre-Integrated Volume Rendering Using Hardware-Accelerated Pixel Shading}},
  year   = {2001},
  pages  = {9-16},
  organziation = {{Eurographics/ACM SIGGRAPH}},
  publisher = {{Addison-Wesley Publishing Company, Inc.}},
  series = {{Annual Conference Series}},
  booktitle = {{Eurographics / SIGGRAPH Workshop on Graphics Hardware '01}}
}