@article{nearoptimalstochasticapproximationfor,
  title = {Near-Optimal Stochastic Approximation for Online Principal Component Estimation},
  author = {Chris Junchi Li and Mengdi Wang and Han Liu and Tong Zhang},
  year = {2016},
  eprint = {1603.05305},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1603.05305v4},
}