TY JOUR TI Cretaceous-Paleogenic fossil resins of Yakutia: molecular composition and thermal properties KW fossil resins KW retinite KW gedanite KW Yakutia JO Vestnik of geosciences AU Martirosyan, O.V. AU Bogdasarov, M.A. PY 2025 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"