AKHMETZHANOV, B.; TAZHIBEKOVA, K.T.; SHAMETOVA , A.A. Kazakhstan’s coal industry: problems and prospects . BUKETOV BUSINESS REVIEW, [S. l.], v. 92, n. 4, p. 63–69, 2018. Disponível em: https://bbr.buketov.edu.kz/index.php/economy-vestnik/article/view/593. Acesso em: 6 nov. 2025.