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3. L. Christoskov, N. V. Kondorskaya, J. Vaněk: Earthquake magnitude in seismological practice:PH, S andL waves. Rozpravy Českosl. Akad. Věd, řada mat. přír. věd 93 (1), Academia, Prague 1983.
4. L. Christoskov, N. V. Kondorskaya, J. Vaněk: Homogeneous magnitude system of the Eurasian continent:S andL waves. Report SE-34, World Data Center A for Solid Earth Geophysics, Boulder 1983.
5. J. Vaněk, N. V. Kondorskaya, L. Christoskov: Earthquake magnitude in seismological practice:PV andPVs. Publishing House of the Bulgarian Academy of Sciences, Sofia 1980 (in Russian).