«The history of political agitation in the Kama region» project: on the path of «Digital political science». PERM UNIVERSITY HERALD. History, [S. l.], v. 30, n. 3, p. 223–227, 2020. Disponível em: https://press.psu.ru/index.php/history/article/view/3488. Acesso em: 26 oct. 2026.