@inproceedings{shirali2008advancedcaptcha,
  author    = {M. Shirali-Shahreza and S. Shirali-Shahreza},
  title     = {Advanced Collage CAPTCHA},
  booktitle = {Proceedings of the 5th International Conference on Information Technology: New Generations (ITNG 2008)},
  address   = {Las Vegas, Nevada, USA},
  month     = apr,
  year      = {2008},
  pages     = {1234--1235},
  doi       = {10.1109/ITNG.2008.12},
  url       = {https://doi.org/10.1109/ITNG.2008.12}
}