@article{structuredsparseprincipalcomponent,
  title = {Structured Sparse Principal Component Analysis},
  author = {Rodolphe Jenatton and Guillaume Obozinski and Francis Bach},
  year = {2009},
  eprint = {0909.1440},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/0909.1440v1},
}