Billi, A., and R. Funiciello. “Concurrent Eruptions at Etna, Stromboli, and Vulcano: Casualty or Causality?”. Annals of Geophysics 51, no. 4 (December 25, 2008). Accessed July 3, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3023.