@article{empiricalstudyofproxtoneandproxtonefor,
  title = {Empirical study of PROXTONE and PROXTONE$^+$ for Fast Learning of Large Scale Sparse Models},
  author = {Ziqiang Shi and Rujie Liu},
  year = {2016},
  eprint = {1604.05024},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1604.05024v1},
}