1. F. Bueche, J. Polymer Sci. 41, 551 (1959).JPSCAU0022-3832
2. (a) J. R. Schaefgen and P. J. Flory, J. Am. Chem. Soc. 70, 2709 (1948); JACSAT0002-7863
3. (b) T. G. Fox and V. Allen, Polymer Preprints, Am. Chem. Soc. Abstr. 3, No. 1, 6 (1962);
4. (c) G. C. Berry (private communication);
5. (d) G. Kraus (private communication).