P. M. Paradisopoulou, V. G. Karakostas, E. E. Papadimitriou, M. D. Tranos, C. B. Papazachos, and G. F. Karakaisis, “Microearthquake study of the broader Thessaloniki area (Northern Greece)”, Ann. Geophys., vol. 49, no. 4-5, Dec. 2006.