@article{nearoptimalalgorithmsfordifferentially,
  title = {Near-Optimal Algorithms for Differentially-Private Principal Components},
  author = {Kamalika Chaudhuri and Anand D. Sarwate and Kaushik Sinha},
  year = {2012},
  eprint = {1207.2812},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1207.2812v3},
}