"Earthquake Scenarios for the Cities of Sofia, Rousse and Vratsa." Information & Security: An International Journal 24 (2009): 51-64.

Glavcheva, Rumiana, Stella Simeonova, and Dimcho Solakov. "A Generalized Macroseismic Model of the High Intensities Fields for Bulgaria." Bulgarian Geophysical Journal  8, no. 3 (1982): 77-83.