INSTITUTIONAL TRANSFORMATIONS OF ENERGY SECTOR IN THE CONTEXT OF EUROPEAN INTEGRATION: SECURITY APPROACH Authors I. Chychkalo-Kondratska https://orcid.org/0000-0003-3123-841X DOI: https://doi.org/10.32702/2307-2105.2026.3.15 Downloads pdf (Українська) Published 2026-03-20 Issue No. 3 (2026): Efektyvna ekonomika Section Статті