1. F. J. McGarry andJ. F. Mandell, 27th Annual Technical Conference of the Reinforced Plastics/Composites Institute of the Society of the Plastics Industry, paper 9-A (1972).
2. F. A. Johnson andJ. C. Radon,Eng. Fract. Mechs. 4 (1972) 555.
3. R. Griffiths andD. G. Holloway,J. Mater. Sci. 5 (1970) 302.
4. A. Ankara, Sussex University, private communication.
5. M. C. Murphy andJ. O. Outwater, 28th Annual Technical Conference, Reinforced Plastics/Composites Institute of SPI, paper 17-A (1973); also 24th Annual Technical Conference, paper 11c (1969).