1. I. M. WARD, ?Mechanical Properties of Solid Polymers?, 2nd Edn (Wiley-Interscience, New York, 1983) Ch. 11.
2. (editor), ?Structure and Properties of Oriented Polymers? (Applied Science, London, 1975).
3. A. PETERLIN,J. Mater Sci. 6 (1971) 490.
4. J. SCHULTZ, ?Polymer Materials Science? (Prentice-Hall, Englewood Cliffs, New Jersey, 1974) Ch. 11.
5. P. D. COATES and I. M. WARD,J. Mater. Sci. 15 (1980) 2897.