Abikenov, A., E. P. Kenzhibekova, N. Kalkayeva, B. A. Taitorina, Y. A. Buribayev, and Z. A. Khamzina. “The Model of Pension System in Chile: Transformation in Kazakhstan”. Kasetsart Journal of Social Sciences, vol. 42, no. 1, Feb. 2021, pp. 117–122, https://so04.tci-thaijo.org/index.php/kjss/article/view/249447.