1. D. V. S. Hurle and R. H. Peters (editors), Fibre Structure [Russian translation], Khimiya, Moscow (1969).
2. S. Ya. Frenkel', Supplement to the translation of the book Polymer Single Crystals, by P. H. Geil [in Russian], Khimiya, Moscow (1968).
3. S. N. Zhurkov, A. I. Slutsker, and A. A. Yastrebinskii, Dokl. Akad. Nauk SSSR, 153, 303 (1963); Fiz. Tverd. Tela, 6, No. 12, 3601 (1964).