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"CAPTCHAs: The Good, the Bad, and the Ugly."
Paul Baecher et al. (2010)
- Paul Baecher, Marc Fischlin, Lior Gordon, Robert Langenberg, Michael Lützow, Dominique Schröder:
CAPTCHAs: The Good, the Bad, and the Ugly. Sicherheit 2010: 353-365
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