M.Kh. Nazirov. SOCIO-ECONOMIC, CULTURAL AND POLITICAL DEVELOPMENT OF THE SECOND BULGARIAN KINGDOM IN THE XI-XIV CENTURIES. ojss [Internet]. 2022 Dec. 26 [cited 2025 Aug. 31];2(06):89-97. Available from: https://www.supportscience.uz/index.php/ojss/article/view/430