Guidoboni, E., and G. Ferrari. “Historical Cities and Earthquakes: Florence During the Last Nine Centuries and Evaluations of Seismic Hazard”. Annals of Geophysics 38, no. 5-6 (November 25, 1995). Accessed October 28, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4081.