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"Telling Computer and Human Apart: Image-Sound Based CAPTCHA System."
Jung Hyun Ryu et al. (2017)
- Jung Hyun Ryu, Nam Yong Kim, Seo Yeon Moon, Jong Hyuk Park:

Telling Computer and Human Apart: Image-Sound Based CAPTCHA System. MUE/FutureTech 2017: 733-736

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