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"A Proposal of Four-Panel Cartoon CAPTCHA."
Takumi Yamamoto, Tokuichiro Suzuki, Masakatsu Nishigaki (2011)
- Takumi Yamamoto, Tokuichiro Suzuki, Masakatsu Nishigaki:
A Proposal of Four-Panel Cartoon CAPTCHA. AINA 2011: 159-166
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