1. Influence of Annealing on the Strength of Corundum Crystals;Heuer;Proc. Brit. Ceram. Soc.,1966
2. Preparation of High-Strength Sapphire Crystals;Mallinder;ibid.
3. 3 H. P. Kirchner , R. M. Gruver , D. R. Platts , P. A. Rishel , and R. E. Walker , “Chemical Strengthening of Ceramic Materials,” Summary Report, Contract N00019-68-C-0142, Naval Air Systems, 1969.
4. Sintering of ZnO: I;Gupta;J. Amer. Ceram. Soc.,1968
5. 5 T. K. Gupta ; to be published.