@inproceedings{proximalquasinewtonforcomputationally,
  title = {Proximal Quasi-Newton for Computationally Intensive L1-regularized M-estimators},
  author = {Kai Zhong and Ian E. H. Yen and Inderjit S. Dhillon and Pradeep Ravikumar},
  year = {2014},
  booktitle = {NeurIPS 2014 12},
  eprint = {1406.7321},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1406.7321v2},
}