1. G. A. Sobolev, Fundamentals of Earthquake Prediction (Nauka, Moscow, 1993) [in Russian].
2. T. Rikitake, Bull. Seismol. Soc. Amer. 65, 1133 (1975).
3. H. Kanamori, The Nature of Seismicity Patterns before Large Earthquakes. Prediction: An International Review, Ed. by D.W. Simpson and P.G. Richards. Maurice Ewing Ser. V. 4 (AGU, Wash. (D.C.), 1981).
4. L. R. Botvina and T. B. Petersen, Dokl. Phys. 46 (1), 56 (2001).
5. L. R. Botvina, P. N. Shebalin, and I. B. Oparina, Dokl. Phys. 46 (2), 119 (2001).