1. P. GOLDFINGER and M. JEUNEHOMME, Trans. Faraday Soc.,
59, 2851 (1963).
2. R. J. CAVENEY, J. Cryst. Growth.
7, 102 (1970).
3. H. SCHAFER, Chemische Transportreaktionen, Weinheim (1962), New York and London (1964).
4. J. H. E. JEFFES, J. Cryst. Growth.
3,4, 13 (1968).
5. D. FAHRENHEIT, Phil. Trans. Roy. Soc.,
33, 78 (1924);