Balducci, O., Bigazzi, G., Cioni, R., Leonardi, M., Meletti, C., Norelli, P., Pescia, A., & Taddeucci, G. (1994). Monitoring 222 Rn in soil gas of Garfagnana (Tuscany) aimed at earthquake prediction. Annals of Geophysics, 37(5). https://doi.org/10.4401/ag-4179