1. Rikitake, T. Earthquake Prediction and Earthquake Warning (in Japanese) p211–212 (Centre for Academic Publications, Japan, 1979).
2. Geller, R. J. Nature 352, 275–276 (1991).
3. Sekiya, H. Coordinating Committee for Earthquake Prediction Report 21, 89–90 (1978) (in Japanese).
4. 20th Anniversary Report of Coordinating Committee for Earthquake Prediction p.12–13 (1990) (in Japanese).
5. Sacks, I. S., Suyehiro, S., Linde, A. T. & Snoke, J. A. Tectonophysics 81, 311–318 (1982).