@article{convergenceofstochasticgradientdescent,
  title = {Convergence of Stochastic Gradient Descent for PCA},
  author = {Ohad Shamir},
  year = {2015},
  eprint = {1509.09002},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1509.09002v2},
}