TY JOUR TI PRODUCTION OF BASE OILS IN RUSSIA KW base oils KW API KW hydrogenation processesbase oils KW API KW hydrogenation processes JO Bulletin of the Angarsk State Technical University AU Litvincev, Y.I. AU Zhavoronkov, D.A. PY 2023 IS 1 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»