@article{robusttextcaptchasusingadversarial,
  title = {Robust Text CAPTCHAs Using Adversarial Examples},
  author = {Rulin Shao and Zhouxing Shi and JinFeng Yi and Pin-Yu Chen and Cho-Jui Hsieh},
  year = {2021},
  eprint = {2101.02483},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2101.02483v1},
}