Akhmetzhanov, B., K.T. Tazhibekova, and A.A. Shametova. “Kazakhstan’s Coal Industry: Problems and Prospects ”. BUKETOV BUSINESS REVIEW 92, no. 4 (December 30, 2018): 63–69. Accessed November 6, 2025. https://bbr.buketov.edu.kz/index.php/economy-vestnik/article/view/593.