@inproceedings{tightconvexrelaxationsforsparsematrix,
  title = {Tight convex relaxations for sparse matrix factorization},
  author = {Emile Richard and Guillaume Obozinski and Jean-Philippe Vert},
  year = {2014},
  booktitle = {NeurIPS 2014 12},
  eprint = {1407.5158},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1407.5158v2},
}