Belardinelli, M. E. “Extended Sources of the Main Events of the Umbria-Marche (1997) Seismic Sequence Inverted from Geophysical Data”. Annals of Geophysics 51, no. 2-3 (December 25, 2008). Accessed July 5, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3030.