1. Fujimoto, H., T. Kanazawa, and H. Murakami, Experiment on precise seafloor acoustic ranging - A promising results of observation -, J. Seismol. Soc. Japan, 48, 289 - 292, 1995.
2. Spiess, F. N., D. E. Boegeman, C. D. Lowenstein, and M. O. McIntyre, Precise sea floor positioning - a progress report, Proc. INSMAP 90, Marine Technology Society, Washington, D. C., USA, 51 - 60, 1991.
3. Spiess, F. N., G. H. Purcell, Jr., L. E. Young, and H. Dragert, Determination of sea floor displacements using precision transponders and GPS, Proc. INSMAP 94, Marine Technology Society, Washington, D. C., USA, 125 - 131, 1994.
4. Yabuki, T., Y. Nagaya, A. Asada, F. Ono, and K. Tajiri, Proc. INSMAP 94, Marine Technology Society, Washington, D. C., USA, 493 - 498, 1994