Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Haichang Gao, Wei Wang, Ye Fan, Jiao Qi, Xiyang Liu. The Robustness of "Connecting Characters Together" CAPTCHAs. J. Inf. Sci. Eng., 30(2):347-369, 2014. [doi]