1. L. H. McCurrich andM. A. T. Adams, Proceedings Conference on ?Composites ? standards, testing and design?, NPL (1974).
2. J. P. Outwater andM. C. Murphy, paper 11c, 24th Annual Technical Conference, S.P.I. Reinforced Plastics Division (1969).
3. A. H. Cottrell,Proc. Roy. Soc. A282 (1964) 2.
4. J. L. Helfet andB. Harris,J. Mater. Sci. 7 (1972) 494.
5. J. Morton andG. W. Groves,ibid,9 (1974) 1436.