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Ponomareva, G.A. and Petrishchev, V.P. 2023. The material composition of the bitumen of the Orenburg Cis-Urals region. Proceedings of Voronezh State University. Series: Geology. 1 (Mar. 2023), 80-88. DOI:https://doi.org/10.17308/geology/1609-0691/2023/1/80-88.