Anandrao, K. S., R. Gupta, P. Ramchandran, and G. V. Rao. “Large Amplitude Free Vibrations of Beams Made of Functionally Graded Material”. Journal of Structural Engineering, vol. 39, no. 5, Dec. 2024, pp. 501-1, http://14.139.176.44/index.php/JOSE/article/view/1026.