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3. E. O. Karaulova, D. N. Levchenko, N. P. Sosnina, et al.,Khim. Tekhnol. Topl. Masel, No. 6, 47 – 48 (1981).
4. F. M. Khutoryanskii, O. V. Alekseev, Yu. V. Danchenko, et al.,Ibid., No. 10, 12 – 15 (1988).