TY JOUR TI Corporate Governance and Firm Value: Theoretical Analysis, Quantitative Methods, and Industry-Specific Aspects (Based on Oil and Gas Companies) KW corporate governance KW firm value KW market capitalization KW cost of capital KW WACC KW ROIC KW economic value added (EVA) KW value drivers KW oil and gas companies KW industry risks KW integrated valuation model KW real options KW ESG factors KW digital transformation KW shareholder protection KW transparency JO Journal of Applied Research AU Redogoschenko, A.V. PY 2026 IS PB ITBO University