Localized CAPTCHA testing on users and farms

Ekaterina Gladkikh, Kirill Nikolaev, Mikhail Nikitin. Localized CAPTCHA testing on users and farms. In Chin-Wan Chung, Andrei Z. Broder, Kyuseok Shim, Torsten Suel, editors, 23rd International World Wide Web Conference, WWW '14, Seoul, Republic of Korea, April 7-11, 2014, Companion Volume. pages 277-278, ACM, 2014. [doi]

Abstract

Abstract is missing.