TY JOUR TI Comparative analysis of inventory management costs in the operation of imported and import-substituted equipment in the oil and gas industry KW inventory management KW import substitution KW oil and gas industry KW total cost of ownership KW spare parts KW logistics costs KW safety stock KW operating expenses JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Sidorov, I.V. AU Tel'piz, G.A. PY 2026 IS 0 PB ITBO University