@article{spanningattackreinforceblackboxattacks,
  title = {Spanning Attack: Reinforce Black-box Attacks with Unlabeled Data},
  author = {Lu Wang and huan zhang and Jin-Feng Yi and Cho-Jui Hsieh and Yuan Jiang},
  year = {2020},
  eprint = {2005.04871},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2005.04871v2},
}