Di Maio, R., Mauriello, P., Patella, D., Petrillo, Z., Piscitelli, S., Siniscalchi, A., & Veneruso, M. (1997). Self-potential, geoelectric and magnetotelluric studies in Italian active volcanic areas. Annals of Geophysics, 40(2). https://doi.org/10.4401/ag-3926