Optical Transmission Modules for Intraoffice Transmission Networks. - Masatoyo Sumida; Hisao Tsuji (IEEE J. Sel. Areas Commun., 1986)

A Synchronous DS4 Multiplexer with Cross-Connect Function. - Ikuo Tokizawa; Hiromi Ueda; Hisao Tsuji (IEEE J. Sel. Areas Commun., 1987)

Large Capacity Multiplex-Port Brouter with SDH Interface for Regional PC Communication Network System. - Kazunari Irie; Norihisa Ohta; Kouichi Suto; Masato Morisaki; Hisao Tsuji (ICC (3), 1997)