@inproceedings{shirali2008bibliography,
  author    = {Shirali-Shahreza, S. and Shirali-Shahreza, M.H.},
  title     = {Bibliography of Works Done on {CAPTCHA}},
  booktitle = {Proceedings of the 3rd International Conference on Intelligent System \& Knowledge Engineering (ISKE 2008)},
  address   = {Xiamen, China},
  month     = nov,
  year      = {2008},
  pages     = {205--210},
  doi		= {10.1109/ISKE.2008.4730926}
}