1. 1) B. Gutenberg and C. F. Richter: Seismicity of the Earth and Associated Phenomena, Princeton University Press (1949).
2. 2) C. F. Richter: Elementary Seismology, Freeman, San-Fransisco (1958).
3. 3) C. Tsuboi: Magnitude-frequency relation for earthquakes in and near Japan, Journ. Phys. Earth, 1, 47-54 (1952).
4. 4) S. Miyamura: Earthquake province and its bearing on geotectonics, Read at the XII General Assembly of IUGG at Helsinki (1960).
5. 5) L. Glangeaud et J. P. Rothé: Cause tectonophysiques et effets morphologiques des séismes d'Orléanville et du Chéliff, Comptes Rendus, Paris, 1829-1831 (1945).