S.Alansari, Luay, Ali M.HAl-Hajjar, and Husam Jawad A. 2019. “Calculating the Natural Frequency of Cantilever Tapered Beam Using Classical Rayleigh, Modified Rayleigh and Finite Element Methods”. International Journal of Engineering & Technology 7 (4): 4866-72. https://doi.org/10.14419/ijet.v7i4.25334.