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Additional information
V. G. Korolenko Glazov State Pedagogical Institute, Udmurt Autonomous SSR. Translated from Mekhanika Polimerov, No. 4, pp. 749–750, July–August, 1977.
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Perepechko, I.I., Prokazov, A.V. Investigation of oriented polycarbonate by an acoustical method. Polymer Mechanics 13, 641–643 (1977). https://doi.org/10.1007/BF00859358
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DOI: https://doi.org/10.1007/BF00859358