Auciello N. A study of the Numerical Convergence of Rayleigh-Ritz Method for the Free Vibrations of Cantilever Beam of Variable Cross-Section with Tip Mass. Eng. Trans. 1996;44(3-4):375-388. Accessed July 19, 2025. https://et.ippt.pan.pl/index.php/et/article/view/1469