https://api.elsevier.com/content/article/pii/S2352484720313391doi:10.1016/j.egyr.2020.09.0271-s2.0-S235248472031339110.1016/j.egyr.2020.09.027S2352-4847(20)31339-1Efficiency of oil companies in Russia in the context of energy and sustainable development Energy ReportsJournal235248472020-11-30November 20201trueFullfalseThird-Party SponsorElsevierWaivedhttp://creativecommons.org/licenses/by-nc-nd/4.0/