Rudneva, O. S., and A. A. Sokolov. ’Analysis of the Readiness of Russian Regions for the COVID-19 Pandemic Based on Demographic Sustainability and Development of the Healthcare System’. Population, Vol. 26, no. 1, Mar. 2023, pp. 160-71, doi:https://doi.org/10.19181/population.2023.26.1.13.