Schema Management in an Object-Oriented Database System. - Atsuo Yoshitaka; Masahiko Hirakawa; Tadao Ichikawa (VDB, 1991)

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

V-QBE: Video Database Retrieval by Means of Example Motion of Objects. - Atsuo Yoshitaka; Masanori Yoshimitsu; Masahiko Hirakawa; Tadao Ichikawa (ICMCS, 1996)