@article{JMLR:v22:20-705,
  author  = {Zengfeng Huang and Xuemin Lin and Wenjie Zhang and Ying Zhang},
  title   = {Communication-Efficient Distributed Covariance Sketch, with Application to Distributed PCA},
  journal = {Journal of Machine Learning Research},
  year    = {2021},
  volume  = {22},
  number  = {80},
  pages   = {1--38},
  url     = {http://jmlr.org/papers/v22/20-705.html}
}