Vartanyan, E.G. (2024) “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, (2), pp. 33–40. Available at: https://journals.bsu.by/index.php/history/article/view/6007 (Accessed: 19 July 2026).