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"CAPTCHA challenge strings: problems and improvements."

Jon Louis Bentley, Colin L. Mallows (2006)

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DOI: 10.1117/12.650644

access: closed

type: Conference or Workshop Paper

metadata version: 2017-05-24

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  dblp key:
  - conf/drr/BentleyM06
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  - https://dblp.org/rec/conf/drr/BentleyM06
Jon Louis Bentley, Colin L. Mallows:
CAPTCHA challenge strings: problems and improvements. DRR 2006: 60670H

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