1. Lee, J. K. W. in Defects and Processes in the Solid State (eds Boland, J. N. &Fitz Gerald, J. D.) 423–446 (Elsevier, New York, (1993)).
2. Roddick, J. C. & van Breemen, O. in Radiogenic Age and Isotopic Studies: Report 8, Geol. Surv. Can. Curr. Res. 1994-F, 1–9 (1994).
3. Reddy, K. P. R. & Cooper, A. R. Oxygen diffusion in sapphire. J. Am. Ceram. Soc. 65, 634–638 (1982).
4. Sinha, A. K., Wayne, D. M. & Essex, R. Flux growth of pure and doped zircons. J. Cryst. Growth 125, 431–439 (1992).
5. Crank, J. The Mathematics of Diffusion (Clarendon, Oxford, (1975)).