Physicochemical or geochemical

• Petrone, P., Giordano, M., Giustino, S., Guarino, F. M., (2011), Enduring fluoride health hazard for the Vesuvius Area population: the case of AD 79 Herculaneum, PLOS ONE, 6(6), e21085, 10.1371/journal.pone.0021085