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      Telling humans and computers apart automatically

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      Communications of the ACM
      Association for Computing Machinery (ACM)

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          Author and article information

          Journal
          Communications of the ACM
          Commun. ACM
          Association for Computing Machinery (ACM)
          00010782
          February 01 2004
          February 01 2004
          : 47
          : 2
          : 56-60
          Article
          10.1145/966389.966390
          66eabd45-09e6-4312-b1f9-221e9b288f20
          © 2004
          History

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