@misc{zhao2002rendering,
  title={Rendering a shear-warped partitioned volume data set},
  author={Zhao, Tiecheng and Bhatia, Vishal C and Hardenbergh, Jan C and Knittel, James M and Lauer, Hugh C and Pfister, Hanspeter},
  year={2002},
  month=jun # "~18",
  publisher={Google Patents},
  note={US Patent 6,407,737}
}