Camassi, R., R. Azzaro, and A. Tertulliani. “Macroseismology: The Lessons Learnt from the 1997/98 Colfiorito Seismic Sequence”. Annals of Geophysics 51, no. 2-3 (December 25, 2008): 331–342. Accessed June 24, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4453.