Healthcare Public Key Infrastructure (HPKI) and Non-profit Organization (NPO): Essentials for Healthcare Data Exchange. - Hiroshi Takeda; Yasushi Matsumura; Katsuhiko Nakagawa; Tadamasa Teratani; Qiyan Zhang; Hideo Kusuoka; Masami Matsuoka (MedInfo, 2004)

Analysis of Yearly Variations in Drug Expenditure for One Patient Using Data Warehouse in a Hospital. - Yufeng Chen; Yasushi Matsumura; Katsuhiko Nakagawa; Shanmei Ji; Hirohiko Nakano; Tadamasa Teratani; Qiyan Zhang; Takahiro Mineno; Hiroshi Takeda (J. Medical Syst., 2007)