ناصر عصام, and محمد علا. “Studying the Effect of Changing the Stiffness Ratio of Beams and Columns of Space Frame Systems and Its Vibration Period on Dynamic Response Values”. Tishreen University Journal -Engineering Sciences Series 43, no. 3 (July 7, 2021). Accessed November 24, 2024. https://journal.tishreen.edu.sy/index.php/engscnc/article/view/10622.