Mazzarini, F.; Favalli, M.; Isola, I.; Neri, M.; Pareschi, M. T. Surface Roughness of Pyroclastic Deposits at Mt. Etna by 3D Laser Scanning. Ann. Geophys. 2008, 51 (5-6), 813-822. https://doi.org/10.4401/ag-4461.