Siskos E, Darvidou K. OIL AND NATURAL GAS TRADE BALANCE AND PRODUCTION EFFECTS IN THE EUROPEAN UNION AND BLACK SEA ECONOMIC COOPERATION COUNTRIES. jee [Internet]. 2018 Apr. 16 [cited 2024 May 4];16(3):261-83. Available from: https://jeej.wunu.edu.ua/index.php/enjee/article/view/1027