Physicochemical or geochemical

• Blanke, J. H., Price, E. W., Rendell, H. M., Terry, J., Townsend, P. D., Wintle, A. G., (1983), Correlations between elephantiasis and thermoluminescence of volcanic soil, Radiation Effects, 73(1-4), 103-113, 10.1080/00337578308220661