M. Shukur, Zainab, Raghad Azeez Neamah, Husam Jawad Abdulsamad, Luay S. Al-Ansari, and Sutartip Wittayapiyanon. “CALCULATING THE NATURAL FREQUENCY OF PRE-TWISTED BEAM”. Journal of Engineering and Sustainable Development 28, no. 1 (January 1, 2024): 1–16. Accessed June 4, 2026. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/2075.