TY JOUR TI Assessment of the impact of the Covid-19 pandemic on the economic security of Russian oil companies based on IFRS reporting KW economic security KW IFRS reporting KW bankruptcy assessment models KW pandemic KW COVID-19 KW oil industry JO Russian Journal of Management AU Bulatenko, M.A. AU Grishina, V.O. AU Grishina, N.O. PY 2021 IS 9 PB Publishing Center RIOR