Tassi, Franco, Felipe Aguilera, Orlando Vaselli, Thomas Darrah, and Eduardo Medina. “Gas Discharges from Four Remote Volcanoes in Northern Chile (Putana, Olca, Irruputuncu and Alitar): A Geochemical Survey”. Annals of Geophysics 54, no. 2 (June 30, 2011). Accessed May 30, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5173.