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INTERACT '09 Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part II
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Proceedings of the 2010 ACM Symposium on Applied Computing
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HCII'11 Proceedings of the 14th international conference on Human-computer interaction: users and applications - Volume Part IV
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Journal of Web Engineering
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A close examination of CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) use and the technology behind it.