@article{sphericalprincipalcomponentanalysis,
  title = {Spherical Principal Component Analysis},
  author = {Kai Liu and Qiuwei Li and Hua Wang and Gongguo Tang},
  year = {2019},
  eprint = {1903.06877},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1903.06877v1},
}