Marzocchi, W. “Earthquake Forecasting in Italy, before and After Umbria-Marche Seismic Sequence 1997. A Review of the Earthquake Occurrence Modeling at Different Spatio-Temporal-Magnitude Scales”. Annals of Geophysics, vol. 51, no. 2-3, Dec. 2008, pp. 405-16, https://doi.org/10.4401/ag-4451.