Nogaibayev М. . Development of the petrochemical industry as a promising area of the oil industry. Economic series of the Bulletin of L.N. Gumilyov ENU, [S. l.], n. 3, p. 80–86, 2023. Disponível em: https://bulecon.enu.kz/index.php/main/article/view/104. Acesso em: 21 jan. 2026.