@article{stochasticzerothordergradientandhessian,
  title = {Stochastic Zeroth Order Gradient and Hessian Estimators: Variance Reduction and Refined Bias Bounds},
  author = {Yasong Feng and Tianyu Wang},
  year = {2022},
  eprint = {2205.14737},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2205.14737v3},
}