Simon S. Woo, Beomjun Kim, Woochan Jun, Jingul Kim. 3DOC: 3D object CAPTCHA. 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 397-398, ACM, 2014. [doi]
Abstract is missing.