Interpretation of Icon Overlapping in Iconic Programming. - Masahito Hirakawa; Yukihiro Nishimura; Motoji Kado; Tadao Ichikawa (VL, 1991)

HI-VISUAL for Hierarchical Development of Large Programs. - Motoji Kado; Masahiko Hirakawa; Tadao Ichikawa (VL, 1992)

HI-VISUAL as a User-Customizable Visual Programming Environment. - Edward Miller; Motoji Kado; Masahito Hirakawa; Tadao Ichikawa (VL, 1995)