@inproceedings{shirali2007online,
  author    = {M. Shirali-Shahreza and S. Shirali-Shahreza},
  title     = {Online Collage CAPTCHA},
  booktitle = {Proceedings of the 8th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2007)},
  address   = {Santorini, Greece},
  month     = jun,
  year      = {2007},
  pages     = {58},
  doi       = {10.1109/WIAMIS.2007.63},
  url       = {https://doi.org/10.1109/WIAMIS.2007.63}
}