Giampiccolo, E., S. Gresta, M. Mucciarelli, G. De Guidi, and M. R. Gallipoli. “Information on Subsoil Geological Structure in the City of Catania (Eastern Sicily) from Microtremor Measurements”. Annals of Geophysics, vol. 44, no. 1, Dec. 2001, doi:10.4401/ag-3606.