Akito Araya, Toshihiko Kanazawa; Optically-linked laser-interferometric tiltmeter for ocean borehole observations, Proceedings of the 1998 International Symposium on Underwater Technology, pp. 168 - 171, April 1998.
H. Fujimoto, T. Kanazawa, Y. Osada; Monitoring seafloor crustal movements: Progress report of relative positioning on the seafloor, Proceedings of the 1998 International Symposium on Underwater Technology, pp. 205 - 209, April 1998.