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2. A set of long-term seismological precursors;Allen,1986
3. Friction of rocks;Byerlee;Pure Appl. Geophys.,1978
4. A computer model for simulating progressive, large-scale movements in blocky rock systems;Cundall,1971
5. Premonitory seismicity patterns in a platform region (Ardennes-Rhenish and Brabant massifs, lower Rhine graben);De Becker;Phys. Earth Planet. Inter.,1989