1. Z. Czerwinski,Szklo Ceram. 15 (1964) 117.
2. Idem, ibid. 16 (1965) 98.
3. V. T. Slayonskii andL. V. Alelsassdrova, Glass Ceram, (New York Consultants Bureau Translation)23 (1966) 529.
4. H. Hoshi, H. Goto, R. Toyota andK. Murakami, Japan Kokai Patent 73–60 714, August 25, 1973.
5. H. P. Cahoon andB. Cutler, Proceedings of the Third Mineral Waste Utility Symposium, (Chicago University Press, Chicago, 1972) p. 353.