Zieger, T., C. Sens-Schönfelder, J. R. Ritter, B.-G. Lühr, and T. Dahm. “P-Wave Scattering and the Distribution of Heterogeneity Around Etna Volcano”. Annals of Geophysics, vol. 59, no. 4, Sept. 2016, p. S0432, doi:10.4401/ag-7085.