Branca, Stefano, Daniele Musumeci, and Luigi Ingaliso. “The Significance of the 1971 Flank Eruption of Etna from Volcanological and Historic Viewpoints”. Annals of Geophysics 64, no. 5 (December 13, 2021): VO543. Accessed April 25, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/8669.