Christoskov, L., D. Gergova, I. Iliev, and V. Rizzo. “Traces of Seismic Effects on Archaeological Sites in Bulgaria”. Annals of Geophysics 38, no. 5-6 (November 25, 1995). Accessed May 6, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4078.