Osmanovna, K. G., Andreevna, I. E., Igorevich, I. N., & Alekseevna, S. V. (2019). Issues of Natural Gas Infrastructure Development in South-Eastern Europe. International Journal of Energy Economics and Policy, 9(6), 415–420. Retrieved from https://www.econjournals.com/index.php/ijeep/article/view/8548