Physicochemical or geochemical

• Rango, T., Bianchini, G., Beccaluva, L., Ayenew, T., Colombani, N., (2009), Hydrogeochemical study in the Main Ethiopian Rift: new insights to the source and enrichment mechanism of fluoride, Environmental Geology, 58, 109-118, 10.1007/s00254-008-1498-3