00747naa#a2200181#i#450# EN\\bibl\71970 20251214032416.7 2712-7761 20231206b2023####ek#y0engy0150####ca RU Geochemistry of organic matter of natural bitumen in the section of the Kozhva river (Timan-Pechora province) Journal article Syktyvkar FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences" 2023 6 с. Journal article local Месторождения углеродистых пород и углеводородов. 553.9 Геохимия. 550.4 Valyaeva O. V. Ryabinkina N. N. komisc.editorum.ru