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