@inproceedings{ijcai2009p345,
  title     = {Streamlining Attacks on CAPTCHAs with a Computer Game},
  author    = {Yan, Jeff and Yu, Su-Yang},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {2095--2099},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/345},
}