Georgiev, Lyubomir, and Krasimira Naydenova. “Development of the Leading Stock Markets and the Challenges to ‘BSE – Sofia’ AD”. Research Papers, no. 1 (May 23, 2020): 223–259. Accessed July 23, 2026. https://bjiep.e-dnrs.org/index.php/rp/article/view/5405.