Zhang, Yunqi, Zeqi Zhang, and Xiaoyu Zhang. “Stock Market Downturn and Stock Market Concentration”. Journal of Economics, Finance and Accounting Studies 5, no. 2 (April 23, 2023): 152–163. Accessed June 7, 2025. https://al-kindipublishers.org/index.php/jefas/article/view/5188.