@inproceedings{shirali2007antispam,
  author    = {S. Shirali-Shahreza and A. Movaghar},
  title     = {A New Anti-Spam Protocol Using CAPTCHA},
  booktitle = {Proceedings of 2007 IEEE International Conference On Networking, Sensing and Control (ICNSC07)},
  address   = {London, UK},
  month     = apr,
  year      = {2007},
  pages     = {234--238},
  doi       = {10.1109/ICNSC.2007.372783},
  url       = {https://doi.org/10.1109/ICNSC.2007.372783}
}