1. E. N. Boulos andN. J. Kreidl,J. Canad. Ceram. Soc. 41 (1972) 83.
2. M. S. Maklad andN. J. Kreidl, Proceedings of the 9th International Congress on Glass, Versailles, France, Vol. 1 (1971) p. 75.
3. F. E. Wagstaff, S. D. Brown andI. B. Cutler,Phys. Chem. Glasses 5 (1964) 76.
4. R. J. Eagan andC. G. Bergeron, ?Advances in Nucleation and Crystallisation in Glasses? (American Ceramic Society, Columbus, 1971) p. 202.
5. S. P. Mukherjee, J. Zarzycki andJ. P. Traverse,J. Mater. Sci. 11 (1976) 341.