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 January 17, 2026. http://et.ippt.gov.pl/index.php/et/article/view/1469