@inproceedings{sumofsquareslowerboundsforsparsepca,
  title = {Sum-of-Squares Lower Bounds for Sparse PCA},
  author = {Tengyu Ma and Avi Wigderson},
  year = {2015},
  booktitle = {NeurIPS 2015 12},
  eprint = {1507.06370},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1507.06370v2},
}