TY JOUR TI Assessment of the efficiency of oil and gas sector enterprises using the example of PJSC Tatneft named after V.D. Shashin KW financial and economic condition KW oil and gas industry KW profitability KW financial indicators KW financial dependence KW cost optimization KW accounting JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Pyhtina, V.A. AU Nevedomskaya, A.O. AU Yahontova, P.I. PY 2026 IS 0 PB ITBO University