1. Bath, M. (1973). Introduction in Seismology, Birkhäuser Verlag, Basel, 395p.
2. Constantinescu, L. and Marza, V.I. (1980) A computer-compiled and computer-oriented catalogue of Romania’s earthquakes during a millennium (AD 984–1979), Rev. Roum. Geophys. 24, 193–234.
3. Geller, R.J. (1976) Scaling relations for earthquake source parameters and magnitudes. Bull. Seismol. Soc. Amer. 66, 1501–1523.
4. Gutenberg, B. (1945) Amplitude of surface waves and magnitudes of shallow earthquakes. Bull. Seismol. Soc. Amer. 35, 3–12.
5. Gutenberg, B. and Richter, C.F. (1954) Seismicity of the Earth and Associated Phenomena. 2nd Edition, Princeton Univ. Press, N.J., 310p.