A survey of consumers' attitudes towards online purchase of contact lenses in Japan. - Tatsuya Nomura; Yoshito Hirayama; Hiroki Iwashima; Shinichi Sakaguchi (Int. J. Electron. Heal., 2010)

Tag Association Based Graphical Password Using Image Feature Matching. - Kyoji Kawagoe; Shinichi Sakaguchi; Yuki Sakon; Hung-Hsuan Huang (DASFAA (2), 2012)