Calabrese, Sergio, Sarah Scaglione, Silvia Milazzo, Walter D’Alessandro, Nicole Bobrowski, Giovanni Bruno Giuffrida, Dario Tedesco, Francesco Parello, and Mathiew Yalire. 2015. “Passive Degassing at Nyiragongo (D.R. Congo) and Etna (Italy) Volcanoes”. Annals of Geophysics 57 (February). https://doi.org/10.4401/ag-6637.