[Karnik et al. 1962]
Karnik, V., N. V. Kondorskaya, Y. V. Riznichenko, Y. F. Savarensky, S. L. Soloviev, N. V. Shebalin, J. Vanek und A. Zatopek (1962).
Standardisation of the earthquake magnitude scales.
Studia Geophysica et Geodaetica, 6:41–48.