1. Ishii, H., T. Yamauchi, and F. Kusumoto, 1997a, Development of high sensitivity borehole strain meters and application for rock mechanics and earthquake prediction study. Rock Stress, 253-258, Balkema, Netherland.
2. Ishii, H., G. Chen, and Y. Ohnishi, 1997b. Estimation of far-field stresses from borehole strain meter observations, Rock Stress, 259-264, Balkema Netherland.
3. Ishii, H., T. Yamauchi, S. Matsumoto, Y. Hirata, and S. Nakao, 2002, Development of multi-component borehole instrument for earthquake prediction study: some observed example of precursory and co-seismic phenomena relating to earthquake swarms and application of the instrument for rock mechanics, Seismogenic Process Monitoring, 365-377, Balkema, Netherland.
4. Ishii, H. and Y. Asai, 2011, Development of borehole stress meter and observed stress data, European Geosciences Union, General Assembly 2011, Wien, Austria, April.
5. Ishii, H. and Y. Asai, 2015, Development of borehole stress meter for studying earthquake prediction and rock mechanics, and stress seismograms of 2011 Tohoku earthquake (M 9.0), Earth, Planets and Space, 67:26, doi 10.1186/s40623-015-0197-z.