@article{anoptimizedsystemtosolvetextbased,
  title = {An optimized system to solve text-based CAPTCHA},
  author = {Ye Wang and Mi Lu},
  year = {2018},
  eprint = {1806.07202},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1806.07202v1},
}