TY JOUR TI ADAPTATION OF COEFFICIENT ANALYSIS TO ASSESS THE EFFECTIVENESS OF CAPITAL-INTENSIVE OIL-PRODUCING COMPANIES KW methodology of economic analysis KW coefficient analysis KW capital intensity KW financial efficiency KW oil-producing companies KW investment cycle KW CAPEX JO Russian Journal of Management AU Smyk, V.M. AU Lyalkova, E.. PY 2026 IS 14 PB Publishing Center RIOR