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"Telling humans and computers apart automatically."

Luis von Ahn, Manuel Blum, John Langford (2004)

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DOI: 10.1145/966389.966390

access: closed

type: Journal Article

metadata version: 2018-11-14

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Luis von Ahn, Manuel Blum, John Langford:
Telling humans and computers apart automatically. Commun. ACM 47(2): 56-60 (2004)

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