1. L. J. Broutman andR. H. Krock (eds), ?Modern Composite Materials? (Addison Wesley, Reading, Mass. and London, 1967) Chapter 2.
2. J. O. Outwater Jun,Mod. Plast. 33 (1956) 156.
3. A. Kelly, ?Strong Solids? (Clarendon Press, Oxford, 1966) Chapter V, p. 139.
4. A. H. Cottrell,Proc. Roy. Soc. London A282 (1963) 1.
5. See alsoA. Kelly,ibid A319 (1970) 95.