Physicochemical or geochemical

• Notcutt, G., Davies, F., (1999), Biomonitoring of volcanogenic fluoride, Furnas Caldera, Sao Miguel, Azores, Journal of Volcanology and Geothermal Research, 92(1-2), 209-214, 10.1016/S0377-0273(99)00077-3