A User Authentication System Using Schema of Visual Memory. - Atsushi Harada; Takeo Isarida; Tadanori Mizuno; Masakatsu Nishigaki (BioADIT, 2006)

Improvement of User Authentication Using Schema of Visual Memory: Guidance by Verbal Cue. - Takumi Yamamoto; Atsushi Harada; Takeo Isarida; Masakatsu Nishigaki (Security and Management, 2007)

Improvement of User Authentication Using Schema of Visual Memory: Exploitation of "Schema of Story". - Takumi Yamamoto; Atsushi Harada; Takeo Isarida; Masakatsu Nishigaki (AINA, 2008)

Advantages of User Authentication Using Unclear Images. - Takumi Yamamoto; Atsushi Harada; Takeo Isarida; Masakatsu Nishigaki (AINA, 2009)