3DOC: 3D object CAPTCHA. - Simon S. Woo; Beomjun Kim; Woochan Jun; Jingul Kim (WWW (Companion Volume), 2014)

Exploration of 3D Texture and Projection for New CAPTCHA Design. - Simon S. Woo; Jingul Kim; Duoduo Yu; Beomjun Kim (WISA, 2016)