https://www.gazeta.ru/politics/2018/11/29_a_12077161.shtml
http://www.kasparov.ru/material.php?id=5BFEF05B1A3B7
http://www.kasparov.ru/material.php?id=5BFEB533D08D3
https://www.bbc.com/russian/news-46360869
https://www.bbc.com/russian/news-46355351
https://www.gazeta.ru/business/2018/11/28/12075415.shtml
https://theins.ru/antifake/129524
https://www.bbc.com/russian/features-46359149