1. U.S. Patent 2,326,059 (3 Aug 1943);
2. U.S. Patent 3,303,115 (5 Feb. 1967).
3. and , in: Amorphous Materials, edited by R. W. Douglas and B. Ellis (Wiley-Interscience, London, 1972), p. 453.
4. City of Light (Oxford University Press, London, 1999), pp.134-146.
5. Corning Inc., ULE Glass Brochure (Corning, Canton, NY, 2004).