A Digital Telephone Set for ISDN. - Seiei Ohkoshi; Koichi Matsumoto; Shizuo Nakano (IEEE J. Sel. Areas Commun., 1986)

A Multi-channel Dissemination System Based on Time-Series Clustering Mechanism for On-Line News Articles. - Koichi Matsumoto; Kazutoshi Sumiya; Kuniaki Uehara (DEXA, 2000)

Optimal portfolio of low liquid assets with a log-utility function. - Koichi Matsumoto (Finance Stochastics, 2006)

Non-linear integer programming based on particle swarm optimisation combining diversification and intensification. - Takeshi Matsui; Masatoshi Sakawa; Kosuke Kato; Koichi Matsumoto (Int. J. Knowl. Eng. Soft Data Paradigms, 2010)

Digital Archive "Dao Fa Hui Yuan" for Daoism Research. - XiaoXiao Feng; Koichi Matsumoto; Shigeo Sugimoto (ICADL, 2011)

Uncovering the Secrets of Daoism Fus Using Digital Dao-Fa Hui-Yuan. - XiaoXiao Feng; Koichi Matsumoto; Shigeo Sugimoto (ICADL, 2012)

Study of Lower Voltage Protection against Plasma Process Induced Damage by Quantitative Prediction Technique. - Yohei Hiura; Shinichi Miyake; Shigetaka Mori; Koichi Matsumoto; Hidetoshi Ohnuma (IRPS, 2020)