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Deciphering CAPTCHAs: What a Turing Test Reveals about Human Cognition
Hannagan T,
Ktori M,
Chanceaux M,
Grainger J
(2012)
Deciphering CAPTCHAs: What a Turing Test Reveals about Human Cognition.
PLOS ONE 7(3): e32121.
https://doi.org/10.1371/journal.pone.0032121