@inproceedings{feng2006a,
  title={A characterization of spherical polyhedral surfaces},
  author={Feng Luo},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224205848071050360},
  booktitle={Journal of Differential Geometry},
  volume={74},
  number={3},
  pages={407-424},
  year={2006},
}