1. F. Alper, A. Alper, and O. Ucan, “The economic impacts of aging societies,” Int. J. Econ. Financial Issues 6 (3), 1225–1238 (2016).
2. V. G. Dobrokhleb and V. N. Barsukov, “Demographic theories and the regional aspect of population ageing,” Econ. Soc. Changes: Facts, Trends, Forecast, No. 6, 89–103 (2017).
3. A. Golini, “Demographic trends and aging in Europe: Prospects, problems, and policies,” Genus, No. 53, 33–74 (1997).
4. M. Kaplan and M. Inguanzo, “The social, economic, and public health consequences of global population aging: Implications for social work practice and public policy,” J. Soc. Work Glob. Comm., No. 1, 1–12 (2017).
5. R. Lee and A. Mason, “Population aging, wealth, and economic growth: Demographic dividends and public policy,” WESS background paper. https://www.un.org/development/desa/dpad/wp-content/uploads/sites/45/PDFs/WESS/wess_bg_papers/bp_wess2007_lee_mason.pdf.