Antokhonova, Inna V., Valentina B. Briukhanova, and Svetlana S. Mikhaylova. 2015. “The Evolution of Sustainability and Socio-Economic Functions of National Pension Systems”. International Journal of Economics and Financial Issues 5 (3S):34-41. https://mail.econjournals.com/index.php/ijefi/article/view/1686.