Эта - с ScienceDirect:
V.V. Korshak, G.V. Kazakova, A.L. Rusanov
Catalytic methods of synthesizing polybenzazoles. Review
Polymer Science U.S.S.R., Volume 31, Issue 1, 1989, Pages 4-21
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http://dx.doi.org/10.1016/0032-3950(89)90342-0
V. V. Korshak, A. L. Rusanov, D. S. Tugushi and S. N. Leont'eva
ynthesis and investigation of N-phenyl-substituted dibenzimidazoles
Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 252–255, February, 1973
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http://dx.doi.org/10.1007/BF00569170
Two-stage synthesis of polybenzimidazoles based on 3,3′-diaminobenzidine and derivatives of terephthalic and 4,4′-diphenyldicarboxylic acids
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 480–481, February, 1969
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http://dx.doi.org/10.1007/BF00905581
A study of the thermal and hydrolytic stability of a number of heterocyclic compounds modelling “ladder-like” polyheteroarylenes
Izvestiya Akakemii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1381–1388, June, 1977
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http://dx.doi.org/10.1007/BF01143919