Risan, Hussam K., Omar Shamal Farhan, and Hiba Imad Abbas. “Numerical Modal Analysis of Reinforced Concrete Slab With Opening”. Al-Nahrain Journal for Engineering Sciences 20, no. 2 (March 25, 2017): 368–377. Accessed November 23, 2024. https://nahje.com/index.php/main/article/view/116.