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3. S. P. Papkov and V. G. Kulichikhin, Liquid-Crystalline State of Polymers (Khimiya, Moscow, 1977) [in Russian].
4. V. G. Kulichikhin and L. K. Golova, Khim. Drev., No. 3, 9 (1985).
5. B. V. Ioffe, Refractometric Methods in Chemistry (Khimiya, Leningrad, 1974) [in Russian].