Bella, F., Biagi, P. F., Caputo, M., Della Monica, G., Ermini, A., Plastino, W., & Sgrigna, V. (1996). Normal and anomalous behaviour of electric, magnetic and seismoacoustic signals recorded in the Amare cave. Annals of Geophysics, 39(1). https://doi.org/10.4401/ag-3954