Gusareva, Nadezda B., Galina I. Andryushchenko, Kristina G. Tsaritova, Vladimir V. Zelenov, and Larisa N. Sorokina. 2019. “Energy Enterprise Risks Analysis Using Fuzzy Logic Methods”. International Journal of Energy Economics and Policy 9 (3):366-72. https://econjournals.com/index.php/ijeep/article/view/7957.