LENKOVA, O. V. Corporate Portfolio of the Oil and Gas Production Enterprise. International Journal of Economics and Financial Issues, [S. l.], v. 6, n. 5S, p. 13–19, 2016. Disponível em: https://www.econjournals.com/index.php/ijefi/article/view/2843. Acesso em: 4 may. 2024.