@article{verificationcoderecognitionbasedonactive,
  title = {Verification Code Recognition Based on Active and Deep Learning},
  author = {Dongliang Xu and Bailing Wang and XiaoJiang Du and Xiaoyan Zhu and zhitao Guan and Xiaoyan Yu and Jingyu Liu},
  year = {2019},
  eprint = {1902.04401},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1902.04401v1},
}