https://novayagazeta.ru/articles/2021/09/21/ot-obnuleniia-k-udvoeniiu
https://www.svoboda.org/a/31467728.html
https://www.rbc.ru/newspaper/2021/09/17/614325119a7947933c9953a0
https://jamestown.org/program/the-russian-elections-and-hidden-regionalist-politics/
http://region.expert/no-parties/
http://region.expert/spb-taxes/