@ARTICLE{Gu_JDG_1,
  author =       {Xianfeng Gu and Feng Luo and Jian Sun and Tianqi
  Wu},
  title =        {A Discrete Uniformization Theorem for Polyhedral
  Surfaces I},
  journal =      {Journal of Differential Geometry (JDG)},
  year =         {2018},
  volume =       {109},
  number =       {2},
  pages =        {223-256},
}