1. 1F. F. Lange , "Task I: Fabrication, Microstructure and Selected Properties of SiAlON Compositions," Final Rept., Naval Air Systems Command, Contract No. N00019-73-C-0208, 1974 .
2. 2S. Wild, P. Grieveson, K. H. Jack, and P. Popper ; pp.385 -95 inSpecial Ceramics 5 . British Ceramic Research Association, Stoke-on-Trent, 1972 .
3. Re-examination of the crystal structure of α-Si3N4
4. Structural Approach to the Problem of Oxygen Content in Alpha Silicon Nitride