@article{minimaxsparseprincipalsubspaceestimation,
  title = {Minimax sparse principal subspace estimation in high dimensions},
  author = {Vincent Q. Vu and Jing Lei},
  year = {2012},
  eprint = {1211.0373},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1211.0373v4},
}