Бакай, М. Л. “The System of Integrated Performance Evaluation of the Effectiveness of Service Production in the Gas Transportation Industry”. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry) 2, no. 14 (May 4, 2018): 82–91. Accessed November 21, 2024. https://eung.nung.edu.ua/index.php/ecom/article/view/32.