1. 1R. E. Kirk, and D. F. Othmer , Encyclopedia of Chemical Technology , vol. 20 ; p.782 . Wiley, Chichester, England, 1982 .
2. 2W. J. Clegg, N. McN. Alford, and J. D. Birchall , "Back Stresses and the Sintering of Composites "; p.247 inBritish Ceramic Proceedings, No. 39, Engineering Ceramics 2. Institute of Ceramics, Stoke-on-Trent, England, 1988 .
3. 4H. P. Hood, and M. E. Nordberg , U.S. Pat. No. 2 106 744, 1938 .
4. Preparation of High-Silica Glasses from Colloidal Gels: I, Preparation for Sintering and Properties of Sintered Glasses