Compact Underground Radar System. - Ichiro Sugimoto; Takashi Kikuta; Masaru Tsunasaki (MVA, 1988)

Internal Pipe Inspection Robot. - Yoshifumi Kawaguchi; Itsuo Yoshida; H. Kurumatani; Takashi Kikuta; Y. Yamada (ICRA, 1995)

Development of Internal Gas Pipe Inspection Robot. - Yoshifumi Kawaguchi; Itsuo Yoshida; Keizo Iwao; Takashi Kikuta (J. Robotics Mechatronics, 1995)