@article{JMLR:v18:16-491,
  author  = {Naman Agarwal and Brian Bullins and Elad Hazan},
  title   = {Second-Order Stochastic Optimization for Machine Learning in Linear Time},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {116},
  pages   = {1--40},
  url     = {http://jmlr.org/papers/v18/16-491.html}
}