@article{JMLR:v20:18-596,
  author  = {HaiYing Wang},
  title   = {More Efficient Estimation for Logistic Regression with Optimal Subsamples},
  journal = {Journal of Machine Learning Research},
  year    = {2019},
  volume  = {20},
  number  = {132},
  pages   = {1--59},
  url     = {http://jmlr.org/papers/v20/18-596.html}
}