1. Powder Met. 8;P Popper,1961
2. G.R. Terwilliger, Properties of Sintered Si3N4, J. Am. Cer. Soc.57, 48, 1961.
3. K. Komeya, private communications.
4. W.R. Billington, J. Chown and A.E.S. White, The Sintering of Silicon Carbide, in Special Ceramics, P. Popper, ed., Vol. 2, 1962.
5. S. Prochazka, unpublished work, G.E. CR&D, Schenectady, N.Y.