Giampiccolo, E., S. Gresta, M. Mucciarelli, G. De Guidi, and M. R. Gallipoli. 2001. “Information on Subsoil Geological Structure in the City of Catania (Eastern Sicily) from Microtremor Measurements”. Annals of Geophysics 44 (1). https://doi.org/10.4401/ag-3606.