КРИЖАНІВСЬКИЙ, Є. І. Scientific and Organizational Principles of Increasing of Extraction of Domestic Oil and Gas and Diversification of Energy Resources Supply for Improving Energy Security of Ukraine. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry), [S. l.], v. 2, n. 12, p. 7–14, 2015. Disponível em: https://eung.nung.edu.ua/index.php/ecom/article/view/109. Acesso em: 6 may. 2024.