1. For an extensive discussion of the problems encountered in polymer crystallization and morphology it is refered to B. Wunderlich “Macromolecular Physics, Academic Press, New York 1976
2. W. A. Little, J. Polymer Sci. C 17, 3 (1967)
3. G. Wegner, Z. Naturforschg. 24b, 824 (1969)
4. F. L. Hirshfeld and G. M. J. Schmidt, J. Polymer Sci. A2, 2181 (1964),
5. G. M. J. Schmidt in Reactivity of the Photoexcited Molecule, p. 227 f. Interscience (1967)