@article{JMLR:v18:16-577,
  author  = {Eugene Ndiaye and Olivier Fercoq and Alexandre Gramfort and Joseph Salmon},
  title   = {Gap Safe Screening Rules for Sparsity Enforcing Penalties},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {128},
  pages   = {1--33},
  url     = {http://jmlr.org/papers/v18/16-577.html}
}