BETTY, D. Analysis of economic management problems and challenges in increasing investment in the upstream oil and gas industry. Jurnal Mantik, [S. l.], v. 7, n. 4, p. 2855-2861, 2024. DOI: 10.35335/mantik.v7i4.4588. Disponível em: https://www.ejournal.iocscience.org/index.php/mantik/article/view/4588. Acesso em: 31 jul. 2026.