Design Considerations of NEC's Wide Area Private Data Communications System. - Tatsuo Usukura; Hitsashi Inoue; Yoshitsugu Watanabe; Nobuo Horii; Shunichi Terai (ICC (1), 1984)

Integrated-Circuit and Packet-Switching Applications to a Loop System for Local Area Networks. - Tohru Kohashi; Akihiro Kitamura; Masaaki Murai; Tatsuo Usukura; Yoshitsugu Watanabe; Nobuo Horii (IEEE J. Sel. Areas Commun., 1985)