CHERNYKH, A.V.; KLYAUS, V.L.; KLYAUS, M.P.; KAMENSKIKH, M.S. The Bulgarian community of the Perm region: formation, settlements, number. Perm Federal Research Centre Journal, [S. l.], n. 1, p. 88–96, 2020. DOI: 10.7242/2658-705X/2020.1.9. Disponível em: https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2020n1p9. Acesso em: 29 may. 2026.