VARTANYAN, Egnara G. Bulgaria and Russia of the early 20th century: from the correspondence of N. S. Derzhavin with Bulgarian scientists. Journal of the Belarusian State University. History, [S. l.], n. 2, p. 33–40, 2024. Disponível em: https://journals.bsu.by/index.php/history/article/view/6007. Acesso em: 18 jul. 2026.