A Speech Scrambler Using the Fast Fourier Transform Technique. - Keiichi Sakurai; Keiichiro Koga; Takuro Muratani (IEEE J. Sel. Areas Commun., 1984)

Performance Competition in Cooperative Capturing by Multi-agent Systems. - Koji Tsumura; Shinji Hara; Keiichi Sakurai; Tae-Hyoung Kim (CCA, 2010)