@article{saad2017corresponding,
  title={Corresponding Supine and Prone Colon Visualization Using Eigenfunction Analysis and Fold Modeling},
  author={Saad Nadeem, Joseph Marino and Gu, Xianfeng and Kaufman, Arie},
  journal={IEEE transactions on visualization and computer graphics},
  volume={23},
  number={1},
  pages={751-760},
  year={2017}
}