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Telling humans and computers apart automatically

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Authors: Luis von Ahn Carnegie Mellon University
Manuel Blum Carnegie Mellon University
John Langford Toyota Technological Institute at Chicago
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· Magazine
Communications of the ACM - Information cities CACM Homepage archive
Volume 47 Issue 2, February 2004
ACM New York, NY, USA
table of contents doi>10.1145/966389.966390
Telling humans and computers apart automatically Published by ACM 2004 Article
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· Citation Count: 60


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