Di Mauro, D., Armadillo, E., Bozzo, E., Cerv, V., De Santis, A., Gambetta, M. and Meloni, A. (1998) “GDS (Geomagnetic Depth Sounding) in Italy: applications and perspectives”, Annals of Geophysics, 41(3). doi: 10.4401/ag-4354.