@article{dosemidefiniterelaxationssolvesparsepca,
  title = {Do semidefinite relaxations solve sparse PCA up to the information limit?},
  author = {Robert Krauthgamer and Boaz Nadler and Dan Vilenchik},
  year = {2013},
  eprint = {1306.3690},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1306.3690v4},
}