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Additional information
Leningrad Branch of the All-Union Scientific Research Institute for Man-Made Fibre. Translated from Khimicheskie Volokna, No.3, pp. 24 – 25, May – June, 1973.
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Kulikova, N.P., Shablygin, M.V. & Utevskii, L.E. Spectroscopic method of determining the degree of imidization of polypyromellitimides. Fibre Chem 5, 268–269 (1973). https://doi.org/10.1007/BF00546048
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DOI: https://doi.org/10.1007/BF00546048