@InProceedings{apvis07-kraus,
  author = {Kraus, M. and Strengert, M. and Klein, T. and Ertl, T.},
  title  = {{Adaptive Sampling in Three Dimensions for Volume Rendering on GPUs}},
  year   = {2007},
  pages  = {113-120},
  booktitle = {{Proceedings Asia Pacific Symposium on Visualization 2007}},
  pages = {113-120}
}