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      Telling humans and computers apart automatically

      Author(s): , ,

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      Journal: Communications of the ACM

      Publisher: Association for Computing Machinery (ACM)

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          Journal
          Title: Communications of the ACM
          Abbreviated Title: Commun. ACM
          Publisher: Association for Computing Machinery (ACM)
          ISSN (Print): 00010782
          Publication date Created: February 01 2004
          Publication date (Print): February 01 2004
          Volume: 47
          Issue: 2
          Pages: 56-60
          Article
          DOI: 10.1145/966389.966390
          Copyright statement: © 2004
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