1. See for instance the summarising review article, A. Peterlin, J. Polymer Sci. C9 (1966) 61.
2. A. Peterlin and G. Meinel, J. Polymer Sci. B3 (1965) 783; J. Appl. Phys. 36 (1965) 3028; J. Appl. Polymer Sci., in press.
3. A. Peterlin and H. G. Olf, J. Polymer Sci. A2, in press.
4. J. Williams, personal communication.
5. C. W. Wilson, 3rd, J. Polymer Sci. A1 (1963) 1305.