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H. Vogel and C. S. Marvel, J. Polymer Sci.,50, 511 (1961).
Y. Iwakura, K. Uno, and I. Imai, J. Polymer Sci.,A-6, 2605 (1964).
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 480–481, February, 1969.
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Korshak, V.V., Rusanov, A.L. & Katsarava, R.D. Two-stage synthesis of polybenzimidazoles based on 3,3′-diaminobenzidine and derivatives of terephthalic and 4,4′-diphenyldicarboxylic acids. Russ Chem Bull 18, 434 (1969). https://doi.org/10.1007/BF00905581