1. Benger, B. (1986) Rolls-Royce Private Communication.
2. Karunaratne, B.S.B. and Lewis, M.H., J. Mater. Sci. 15 449 (1980).
3. Lewis, M.H., Mason, S. and Szweda, A., in ‘Non-Oxide Engineering and Technical Ceramics’ ed. S. Hampshire (Elsevier 1986) 175.
4. Tuersley, J.P., Leng-Ward, G. and Lewis, M.H., in ‘Ceramic Materials and Components for Engines’ ed. V.I. Tennery, (Amer. Ceram. Soc. Inc. 1989) 856.
5. Tuersley J.P., Leng-Ward, G. and Lewis, M.H., in ‘Engineering with Ceramics ‘(Inst. of Ceramics 1990) 231.