Rotondi, R.; Tertulliani, A.; Brambilla, C.; Zonno, G. The Intensity Attenuation of Colfiorito and Other Strong Earthquakes: The Viewpoint of Forecasters and Data Gatherers. Ann. Geophys. 2008, 51 (2-3), 499-507. https://doi.org/10.4401/ag-4447.