Ultimatelink Between Characters Having a Certain Meaning in Physical Space to URL in Cyberspace with Robust Print and Scan. - Keiji Yamadera; Michiharu Niimi (APSIPA ASC, 2023)

Improved Ultimate Link without Markers for Projective Transformation. - Keiji Yamadera; Michiharu Niimi (APSIPA, 2024)