@article{wang2003volumetric,
  title={Volumetric harmonic map},
  author={Wang, Yalin and Gu, Xianfeng and Yau, Shing-Tung and others},
  journal={Communications in Information \& Systems},
  volume={3},
  number={3},
  pages={191--202},
  year={2003},
  publisher={International Press of Boston}
}