@inproceedings{shirali2007passwordless,
  author    = {M. Shirali-Shahreza and S. Shirali-Shahreza},
  title     = {Passwordless Login System for Mobile Phones Using CAPTCHA},
  booktitle = {Proceedings of the 49th International Symposium ELMAR-2007 focused on Mobile Multimedia},
  address   = {Zadar, Croatia},
  month     = sep,
  year      = {2007},
  pages     = {243--246},
  doi       = {10.1109/ELMAR.2007.4418840},
  url       = {https://doi.org/10.1109/ELMAR.2007.4418840}
}