@article{anoptimalrandomizedincrementalgradient,
  title = {An optimal randomized incremental gradient method},
  author = {Guanghui Lan and Yi Zhou},
  year = {2015},
  eprint = {1507.02000},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1507.02000v3},
}