@inproceedings{shirali2007blind,
  author    = {M. Shirali-Shahreza and S. Shirali-Shahreza},
  title     = {CAPTCHA for Blind People},
  booktitle = {Proceedings of the 7th IEEE International Symposium on Signal Processing and Information Technology (ISSPIT 2007)},
  address   = {Cairo, Egypt},
  month     = dec,
  year      = {2007},
  pages     = {1006--1009},
  doi       = {10.1109/ISSPIT.2007.4458048},
  url       = {https://doi.org/10.1109/ISSPIT.2007.4458048}
}