For citations:
Troitsky A.V., Baykova O.V., Brents V.I., Razinkov M.I. Financial analysis of the leading oil and gas companies in the Russian Federation for 2021. Vestnik Universiteta. 2022;1(11):162-170. (In Russ.) https://doi.org/10.26425/1816-4277-2022-11-162-170