1. R. C. Allen,Polym. Eng. Sci. 19 (1979) 329.
2. J. Aveston, Proceedings of the 3rd International Conference on composite materials, Paris, 1980 (Pergamon Press, Oxford, 1980) p. 556.
3. D. Hull andP. J. Hogg,ibid. 543.
4. Paper 22-E;J. C. Haarsma,1979
5. Paper 13-D;S. Tonp,1979