H. A. Dawood and O. I. Abdullah, “Free Vibration Analysis for Dynamic Stiffness Degradation of Cracked Cantilever Plate”, alkej, vol. 1, no. 2, pp. 86–102, Dec. 2017, Accessed: Jan. 04, 2026. [Online]. Available: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/14