Takumi Yamamoto, Tokuichiro Suzuki, Masakatsu Nishigaki. A Proposal of Four-Panel Cartoon CAPTCHA: The Concept. In Tomoya Enokido, Fatos Xhafa, Leonard Barolli, Makoto Takizawa, Minoru Uehara, Arjan Durresi, editors, The 13th International Conference on Network-Based Information Systems, NBiS 2010, Takayama, Gifu, Japan, 14-16 September 2010. pages 575-578, IEEE Computer Society, 2010. [doi]
Abstract is missing.