1. 2. C. A. Angell, D. J. List, and J. Kieffer , "Glassforming Liquid Oxides at the Fragile Limit of the Viscosity-Temperature Relationship ", Proc. XV Int. Cong. on Glass, Leningrad, 204 -209 (1989 ).
2. 4. T. S. Izumitani , Optical Glass ; p. 19 . American Institute of Physics Translation Series, New York, 1986 .