Bruno, V., M. Aloisi, A. Bonforte, G. Immè, and G. Puglisi. “Atmospheric Anomalies over Mt.Etna Using GPS Signal Delays and Tomography of Radio Wave Velocities”. Annals of Geophysics 50, no. 2 (December 25, 2007): 267–282. Accessed April 20, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4417.