Overview of promising manufacturers in the oil and gas sector of the Republic of Kazakhstan. Вестник КазНУ. Серия Экономическая, [S. l.], v. 116, n. 4/2, 2016. Disponível em: https://be.kaznu.kz/index.php/math/article/view/1348. Acesso em: 19 июл. 2026.