An Ultrasonic 3D Positioning System Using a Single Compact Receiver Unit. - Masanori Sugimoto; Kan Tulathimutte; Toshio Ito; Tetsuya Sato; Hiromichi Hashizume (LoCA, 2009)

A Scalable Tracking System Using Ultrasonic Communication. - Toshio Ito; Tetsuya Sato; Kan Tulathimutte; Masanori Sugimoto; Hiromichi Hashizume (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)