Fedirko, Mykhailo, Oksana Huhul, and Bohdan Brych. “Theoretical and Applied Aspects of Developing the Energy Services Market in Ukraine”. Herald of Economics, no. 1(87) (July 8, 2019): 7–19. Accessed December 6, 2025. https://visnykj.wunu.edu.ua/index.php/htneu/article/view/900.