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"Re: CAPTCHAs-Understanding CAPTCHA-Solving Services in an Economic Context."
Marti Motoyama et al. (2010)
- Marti Motoyama, Kirill Levchenko, Chris Kanich, Damon McCoy, Geoffrey M. Voelker, Stefan Savage:
Re: CAPTCHAs-Understanding CAPTCHA-Solving Services in an Economic Context. USENIX Security Symposium 2010: 435-462
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