Physicochemical or geochemical

• Horwell, C. J., Braña, L. P., Sparks, R. S. J., Murphy, M. D., Hards, V. L., (2001), A geochemical investigation of fragmentation and physical fractionation in pyroclastic flows from the Soufrière Hills volcano, Montserrat, Journal of Volcanological Geothermal Research, 109(4), 247-262, 10.1016/S0377-0273(00)00319-X