Barrier, E., Chamot-Rooke, N., Giordano, G., 2004. Geodynamic map of the Mediterranean, Sheet 1- Tectonics and Kinematics, CGMW, France.
Botev, E., Protopopova, V., Popova, I., Babachkova, B., Velichkova, S., Tzoncheva, I., Dimitrova, S., Boychev, V., Lazarov, D. Raykova, P., 2013. Data and analysis of the events recorded by NOTSSI in 2012, Bulgarian Geophysical Journal, Sofia, v.38, 93-102.
Georgiev, I. Dimitrov, D., Belijashki, T., Pashova, L., Shanov, S., Nikolov, G., 2007. Geodetic constraints on kinematics of southwestern Bulgaria from GPS and leveling data, Geological Society, London, Special Publications, 2007; 291: 143-157.
Protopopova, V., 2013. Fault plane solutions of the 2012 MW 5.6 Pernik (SW Bulgaria) earthquake and the strongest aftershocks. Bulg. Geoph. Journal, Sofia, v.39, 43-51.