Usability Comparison of Text CAPTCHAs Based on English and Chinese. - Junnan Yu; Xuna Ma; Ting Han (HCI (11), 2016)

Four-Dimensional Usability Investigation of Image CAPTCHA. - Junnan Yu; Xuna Ma; Ting Han (CoRR, 2016)

Usability Investigation on the Localization of Text CAPTCHAs: Take Chinese Characters as a Case Study. - Junnan Yu; Xuna Ma; Ting Han (TE, 2017)