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"Pitfalls in CAPTCHA design and implementation: The Math CAPTCHA, a case study."
Carlos Javier Hernández-Castro, Arturo Ribagorda (2010)
- Carlos Javier Hernández-Castro, Arturo Ribagorda:
Pitfalls in CAPTCHA design and implementation: The Math CAPTCHA, a case study. Comput. Secur. 29(1): 141-157 (2010)

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