1. H. G. Tattersall andG. Tappin,J. Mater. Sci. 1 (1966) 296.
2. A. Kelly, in ?Strong Solids? (Oxford University Press, 1966).
3. G. Cooper andA. Kelly, ASTM STP-452, 1969.
4. J. O. Outwater andM. C. Murphy, 24th Annual Technical Conference, Composites Division, Society of Plastics Industry, Inc. Paper IIc (1969).
5. C. Gurney andJ. Hunt,Proc. Roy. Soc. (Lond.) A299 (1967) 508.