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2. E. R. Caley, “Analyses of Ancient Glasses 1790–1957. A Comprehensive and Critical Survey”, Monographs Vol. 1 (The Corning Museum of Glass, Corning, NY, 1962).
3. C. J. Iliffe andR. G. Newton,Verres Refract. 30 (1976) 30.
4. R. G. Newton,J. Glass Studies 17 (1975) 373.
5. J. C. Ferranzini,Verres Refract. 30 (1976) 26.