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2. Seismic waves with frequencies from 1 to 100 cycles per second recorded in a deep mine in Northern New Jersey;Isacks;Bull. Seism. Soc. Am.,1964
3. Elementary Seismology;Richter,1958
4. Magnitude and energy of earthquakes;Gutenberg;Ann. Geof.,1956
5. The magnitude-frequency relation of earthquakes and its bearing on geotectonics;Miyamura;Proc. Japan Acad.,1962