O. T. Olotu, O. O. Agboola, J. A. Gbadeyan, P. O. Adeniran, and J. O. Akinremi, “Free Vibration Analysis of an Axially Functionally Graded Rotating Tapered Rayleigh Beam Using Differential Transform and Variational Iteration Methods”, FNAS-JAPS, vol. 2, no. 2, pp. 49–72, Mar. 2025.