Christos Fidas, Artemios G. Voyiatzis. An empirical study on efficiency and effectiveness of localized vs. Latin-based CAPTCHA challenges. In Panayiotis H. Ketikidis, Konstantinos G. Margaritis, Ioannis P. Vlahavas, Alexander Chatzigeorgiou, George Eleftherakis, Ioannis Stamelos, editors, 17th Panhellenic Conference on Informatics, PCI 2013, Thessaloniki, Greece - September 19 - 21, 2013. pages 91-97, ACM, 2013. [doi]
Abstract is missing.