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2. M. A. Martynov and K. A. Vylegzhanina, X-Ray Diffraction Study of Polymers [in Russian], Khimiya, Leningrad (1972).
3. P. H. Hermans and A. Weidinger, Text. Res. J. 31, 558–571 (1961).
4. J. J. Creely, L. Segal, and H. M. Ziifle, Ibid., 26,, 789–795 (1956).
5. P. H. Geil, Polymer Single Crystals [Russian translation], Khimiya, Leningrad (1968).