Physicochemical or geochemical

• Horwell, C. J., Fenoglio, I., Ragnarsdottir, K. V., Sparks, R. S. J., Fubini, B., (2003), Surface reactivity of volcanic ash from the eruption of Soufrière Hills volcano, Montserrat, with implications for health hazards, Environmental Research, 93(2), 202-215, 10.1016/S0013-9351(03)00044-6