DOI:
10.1055/s-00000118
Radiologie up2date
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References
Motoyama M, Levchenko K, Kanich C. et al.
Re: CAPTCHAs – Understanding CAPTCHA-Solving Services in an Economic Context.
In: USENIX Securityʼ10: Proceedings of the 19th USENIX conference on Security. 2010: 18 Im Internet (Stand: 31.03.2022):
https://dl.acm.org/doi/10.5555/1929820.1929858
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