1. W. B. Klemperer, in ?Theodore van Karman Anniversary Volume,Appl. Mechanics?, (California Institute of Technology, 1941) p. 328.
2. S. S. Sternstein, L. Ongchin andA. Silverman, in ?Applied Polymer Symposia No. 7? (Interscience, New York, 1968) p. 175.
3. M. Bevis andD. Hull,J. Mater. Sci. 5 (1970) 983.
4. S. Rabinowitz andP. Beardmore,CRC Crit. Rev. Macro. Sci. 1 (1972) 1.
5. T. T. Wang, M. Matsuo andT. K. Kwei,J. Appl. Phys. 42 (1971) 4188.