Shubat, Oksana Mikhaylovna, and Irina Viktorovna Shmarova. “Cluster Analysis As an Analytical Tool of Population Policy”. Economy of Regions 13, no. 4 (November 27, 2017): 1175–1183. Accessed June 4, 2026. https://economyofregions.org/ojs/index.php/er/article/view/2041.