DOLPHIN: An Autonomous Indoor Positioning System in Ubiquitous Computing Environment. - Yasuhiro Fukuju; Masateru Minami; Hiroyuki Morikawa; Tomonori Aoyama (WSTFES, 2003)

DOLPHIN: A Practical Approach for Implementing a Fully Distributed Indoor Ultrasonic Positioning System. - Masateru Minami; Yasuhiro Fukuju; Kazuki Hirasawa; Shigeaki Yokoyama; Moriyuki Mizumachi; Hiroyuki Morikawa; Tomonori Aoyama (UbiComp, 2004)