@inproceedings{shirali2008motion,
  author    = {M. Shirali-Shahreza and S. Shirali-Shahreza},
  title     = {Motion CAPTCHA},
  booktitle = {Proceedings of the Conference on Human System Interaction (HSI 2008)},
  address   = {Krakow, Poland},
  month     = may,
  year      = {2008},
  pages     = {1042--1044},
  doi       = {10.1109/HSI.2008.4581589},
  url       = {https://doi.org/10.1109/HSI.2008.4581589}
}