1. G. E. DIETER: in ‘Engineering design: A materials and processing approach’; 1983, New York/London, McGraw-Hill.
2. F. A. A. CRANE and J. A. CHARLES: in ‘Selection and use of engineering materials’; 1984, London, Butterworths.
3. R. MORRELL: ‘Handbook of properties of technical and engi-neering ceramics’, Part 1; 1985, London, HMSO.