Arciaga, M., Pastor, M., Batac, R., Bantang, J., and Monterola, C. (2009) Experimental observation and an empirical model of enhanced heap stability resulting from the mixing of granular materials, J. Stat. Mech. Theory Exp., P07040, doi :10.1088/1742-5468/2009/07/P07040.
Grosse, P., Euillades, P.A., Euillades, L.D., and van Wyk de Vries, B. (2014) A global database of composite volcano morphometry, Bull. Volcanol., 76, 784, doi : 10.1007/s00445-013-0784-4.