DEBERDIEVA, E. M. Systemic Representation of Sophisticated Economic Structures of Oil and Gas Sector of the Economy. International Journal of Economics and Financial Issues, [S. l.], v. 6, n. 8S, p. 332–339, 2016. Disponível em: https://www.econjournals.com/index.php/ijefi/article/view/3760. Acesso em: 2 may. 2024.