Sermagambet, U., and G. Smagulova. “Ways to Overcome the Inequality of Socio-Economic Development of the Regions of Kazakhstan”. Journal of Economic Research & Business Administration 138, no. 4 (December 29, 2021): 91–101. Accessed April 2, 2025. https://be.kaznu.kz/index.php/math/article/view/2385.