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"Development of two novel face-recognition CAPTCHAs: A security and ..."
Guido Schryen, Gerit Wagner, Alexander Schlegel (2016)
- Guido Schryen, Gerit Wagner

, Alexander Schlegel
:
Development of two novel face-recognition CAPTCHAs: A security and usability study. Comput. Secur. 60: 95-116 (2016)

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