Tassi, F., Aguilera, F., Vaselli, O., Darrah, T. and Medina, E. (2011) “Gas discharges from four remote volcanoes in northern Chile (Putana, Olca, Irruputuncu and Alitar): a geochemical survey”, Annals of Geophysics, 54(2). doi: 10.4401/ag-5173.