Surinov, Alexandr Evgenevich, and Artur Borisovich Luppov. “Influence of Regional Differences in the Cost of Living on National Income Inequality”. Economy of Regions 17, no. 3 (September 28, 2021): 814–827. Accessed October 25, 2026. https://economyofregions.org/ojs/index.php/er/article/view/1595.