%0 Journal Article %T Geochemistry of organic matter of natural bitumen in the section of the Kozhva river (Timan-Pechora province) %A Valyaeva, O.V. %A Ryabinkina, N.N. %K natural bitumen, biomarker hydrocarbons, biodegradation, Timan-Pechora province, Upper Famenian deposits, carbon isotopy %J Vestnik of geosciences %D 2023 %N 0 %P 6 %I FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"