Vavilova, Daiana D., and Karolina V. Ketova. “Influence of Family Residence and Birth Order on Regional Fertility Rates (the Case of Udmurtia, Russia)”. Economy of Regions 21, no. 2 (June 30, 2025): 435–451. Accessed April 2, 2026. https://economyofregions.org/ojs/index.php/er/article/view/1015.