@inproceedings{signoptaqueryefficienthardlabel,
  title = {Sign-OPT: A Query-Efficient Hard-label Adversarial Attack},
  author = {Minhao Cheng and Simranjit Singh and Patrick Chen and Pin-Yu Chen and Sijia Liu and Cho-Jui Hsieh},
  year = {2019},
  booktitle = {ICLR 2020 1},
  eprint = {1909.10773},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1909.10773v3},
}