@article{JMLR:v22:20-156,
  author  = {Xun Qian and Zheng Qu and Peter Richtárik},
  title   = {L-SVRG and L-Katyusha with Arbitrary Sampling},
  journal = {Journal of Machine Learning Research},
  year    = {2021},
  volume  = {22},
  number  = {112},
  pages   = {1--47},
  url     = {http://jmlr.org/papers/v22/20-156.html}
}