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Henry S. Baird, Jon Louis Bentley. Implicit CAPTCHAs. In Elisa H. Barney Smith, Kazem Taghva, editors, Document Recognition and Retrieval XII, 16-20 January 2005, San Jose, California, USA, Proceedings. Volume 5676 of SPIE Proceedings, pages 191-196, SPIE, 2005. [doi]

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