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

Physicochemical or geochemical

• Baxter, P. J., Bonadonna, C., Dupree, R., Hards, V. L., Kohn, S. C., Murphy, M. D., Nichols, A., Nicholson, R. A., Norton, G., Searl, A., Sparks, R. S. J., Vickers, B. P., (1999), Cristobalite in Volcanic Ash of the Soufriere Hills Volcano, Montserrat, British West Indies, Science, 283(5405), 1142-1145, 10.1126/science.283.5405.1142