Полянська, А. С. “Formation of Logistic Chain of Gas Supply Within the Context of Implementation of the Law «About the Natural Gas Market»”. Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas (Series: Economics and Management in the Oil and Gas Industry), vol. 2, no. 14, May 2018, pp. 58-67, https://eung.nung.edu.ua/index.php/ecom/article/view/29.