1. M. Ya. Balbachan and I. S. Tomashevskaya, Dokl. Akad. Nauk SSSR 296 (5), 1085–1089 (1987).
2. M. A. Yaroslavskii and N. K. Kapustyan, Dokl. Akad. Nauk SSSR 315 (2), 353–354 (1990).
3. A. Zakupin, L. Bogomolov, V. Mubassarova, G. Kachesova, and B. Borovsky, in Acoustic Emission, Ed. by W. Sikorski (InTech, Rijeka, 2012), pp. 173–198.
4. M. S. Antsyferov, Dokl. Akad. Nauk SSSR 144 (6), 1295–1297 (1962).
5. J. Sobotka, Acta Geophys. 58 (1), 163–172 (2010).