@article{JMLR:v20:18-875,
  author  = {Zengfeng Huang},
  title   = {Near Optimal Frequent Directions for Sketching Dense and Sparse Matrices},
  journal = {Journal of Machine Learning Research},
  year    = {2019},
  volume  = {20},
  number  = {56},
  pages   = {1--23},
  url     = {http://jmlr.org/papers/v20/18-875.html}
}