@article{liu2015properly,
  title={Properly constrained orthonormal functional maps for intrinsic symmetries},
  author={Liu, Xiuping and Li, Shuhua and Liu, Risheng and Wang, Jun and Wang, Hui and Cao, Junjie},
  journal={Computers \& Graphics},
  volume={46},
  pages={198--208},
  year={2015},
  publisher={Elsevier}
}