The robustness of hollow CAPTCHAs. - Haichang Gao; Wei Wang; Jiao Qi; Xuqin Wang; Xiyang Liu; Jeff Yan (CCS, 2013)

A Simple Generic Attack on Text Captchas. - Haichang Gao; Jeff Yan; Fang Cao; Zhengya Zhang; Lei Lei; Mengyun Tang; Ping Zhang; Xin Zhou; Xuqin Wang; Jiawei Li (NDSS, 2016)

Robustness of text-based completely automated public turing test to tell computers and humans apart. - Haichang Gao; Xuqin Wang; Fang Cao; Zhengya Zhang; Lei Lei; Jiao Qi; Xiyang Liu (IET Inf. Secur., 2016)

Bootstrapping the transformed goodness-of-fit test on heavy-tailed GARCH models. - Xuqin Wang; Muyi Li (Comput. Stat. Data Anal., 2023)