Крижанівський ЄІ. 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. ecom [Internet]. 2015 Sep. 1 [cited 2025 Apr. 3];2(12):7-14. Available from: https://eung.nung.edu.ua/index.php/ecom/article/view/109