Ragulina, Yulia Vyacheslavovna, Aleksei Valentinovich Bogoviz, Svetlana Vladislavlevna Lobova, and Alexander Nikolaevich Alekseev. 2018. “An Aggregated Energy Security Index of Russia, 1990-2015”. International Journal of Energy Economics and Policy 9 (1):212-17. https://www.econjournals.com/index.php/ijeep/article/view/7209.