VARTANYAN, Egnara G. BULGARIA AND RUSSIA OF THE EARLY 20th CENTURY: FROM THE CORRESPONDENCE OF N. S. DERZHAVIN WITH BULGARIAN SCIENTISTS. Zhurnal Belorusskogo Gosudarstvennogo Universiteta. Istoriya, [S. l.], v. 6, n. 2, p. 33–40, 2024. DOI: 10.33581/stb7b512. Disponível em: https://journals-bsu.com/index.php/history/article/view/46. Acesso em: 10 oct. 2025.