A hierarchical structure for concurrency control in a distributed database system. - Haruaki Yamazaki; Sadayuki Hikita; Isamu Yoshida; Suguru Kawakami; Yutaka Matsushita (SIGCOMM, 1979)

Cost Evaluation of Directory Management Schemes for Distributed Database Systems. - Yutaka Matsushita; Haruaki Yamazaki; Sadayuki Hikita; Isamu Yoshida (SIGMOD Conference, 1980)

Optimization of the file access method in content-addressable database access machine (CADAM). - Sadayuki Hikita; Haruaki Yamazaki; Kiyoshi Hasegawa; Yutaka Matsushita (AFIPS National Computer Conference, 1981)

Database Machine FREND. - Sadayuki Hikita; Suguru Kawakami; Hiromi Haniuda (IWDM, 1985)

A stepwise approach to distributed database systems by database machines. - Sadayuki Hikita; Suguru Kawakami; Hiromi Haniuda (SIGSMALL, 1985)

Approaches to an Integrated Office Environment. - Makoto Yoshida; Makoto Kotera; Kyoko Yokoyama; Sadayuki Hikita (FJCC, 1986)

An Approach for Customizing Services of Database Machines. - Sadayuki Hikita; Suguru Kawakami; Akifumi Sakomoto; Yutaka Matsushita (IWDM, 1987)

REAM: An SQL Based and Extensible Relational Database Management System. - Suguru Kawakami; Takashi Nakayama; Koichi Kashiwabara; Sadayuki Hikita (DASFAA, 1989)