https://jamestown.org/program/the-russian-elections-and-hidden-regionalist-politics/
http://www.kasparov.ru/material.php?id=613C821014699§ion_id=444F8A447242B
http://region.expert/no-parties/
http://region.expert/spb-taxes/
http://www.kasparov.ru/material.php?id=61389BE0D3378
https://novayagazeta.ru/articles/2021/09/07/ogon-voda-govno-v-podvalakh