Gusareva, N. B., G. I. Andryushchenko, K. G. Tsaritova, V. V. Zelenov, and L. N. Sorokina. “Energy Enterprise Risks Analysis Using Fuzzy Logic Methods”. International Journal of Energy Economics and Policy, vol. 9, no. 3, Apr. 2019, pp. 366-72, https://www.econjournals.com/index.php/ijeep/article/view/7957.