“Free Vibration of Initially Deflected Axially Functionally Graded Non-Uniform Timoshenko Beams on Elastic Foundation”, RJAV, vol. 15, no. 2, pp. 75–89, Jan. 2019, Accessed: Apr. 29, 2026. [Online]. Available: https://rjav.sra.ro/index.php/rjav/article/view/19