CIACCIO, M. G.; PONDRELLI, S.; FREPOLI, F. Earthquake fault-plane solutions and patterns of seismicity within the Umbria Region, Italy. Annals of Geophysics, [S. l.], v. 49, n. 4-5, 2006. DOI: 10.4401/ag-3110. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3110. Acesso em: 21 may. 2022.