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"Audio CAPTCHA: Existing solutions assessment and a new implementation for ..."
Yannis Soupionis, Dimitris Gritzalis (2010)
- Yannis Soupionis, Dimitris Gritzalis:
Audio CAPTCHA: Existing solutions assessment and a new implementation for VoIP telephony. Comput. Secur. 29(5): 603-618 (2010)
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