1. A. Fourdeux, R. Perret and W. Ruland, ?Carbon Fibres: Their Composites and Applications? (Plastics Institute, London, 1971) p. 57.
2. R. Moreton, Fibre Sci. Technol. 1 (1968) 273.
3. J. W. Johnson, Appl. Polym. Symp. 9 (1969) 229.
4. J. W. Johnson and D. J. Thorrne, Carbon 7 (1969) 659.
5. J. V. Sharp and S. G. Burnay, ?Carbon Fibres: Their Composites and Applications? (Plastics Institute, London, 1971) p. 68.