1. L. J. Broutman,Modern Plastics 42 (1965) 143.
2. M. J. Owen, andR. Dukes,J. Strain Anal. 2 (1967) 272.
3. L. J. Broutman, andS. Sahu,ASTM S.T.P. 497 (1972) 170.
4. A. D. S. Diggwa, andR. H. Norman,Plastics and Polymers 40 (1972) 263.
5. M. J. Owen, andS. Morris,ibid 40 (1972) 209.