1. J. Wylot andE. Greco, US Patent 3914129, C 03C, 3/12(1975).
2. E. Greco, G. Blair andG. Rindone, US Patent 3690 908, C 03C 3/30 (1972).
3. M. Imaoka, ?Advances in Glass Technology?, technical paper 6th International Congress on Glass, July, Washington DC (1962).
4. O. Mazurin, M. Streltsina andI. Shvaikoshvaikovskaya, ?Svoistva stekol i stekloobrazuyushchikh rasplavov? Vol. II (Nauka, Leningrad, 1975) pp. 581?606.
5. Idem, ibid.? Vol. IV, Part 1 (Nauka, Leningrad, 1980) pp. 416?433.