Greco, F., Carmisciano, C., Del Negro, C., Loretti, I., Sicali, A. and Stefanelli, P. (2008) “Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano”, Annals of Geophysics, 51(1), pp. 87–103. doi: 10.4401/ag-4441.