https://novayagazeta.ru/articles/2021/09/22/vlasti-rossii-ne-smogut-pomeshat-vsemu-miru-uznat-pravdu
https://www.bbc.com/russian/features-48789008
https://www.bbc.com/russian/news-58637827
https://www.fr.de/politik/putin-geht-in-selbstisolation-90983527.html
https://www.ng.ru/nauka/2021-09-07/9_8245_demography.html