S.Alansari, Luay, Ali M.HAl-Hajjar, and Husam Jawad A. “Calculating the Natural Frequency of Cantilever Tapered Beam Using Classical Rayleigh, Modified Rayleigh and Finite Element Methods”. International Journal of Engineering and Technology 7, no. 4 (February 15, 2019): 4866–4872. Accessed May 12, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/25334.