Anandrao, Khalane, R. Gupta, P. Ramachandran, and G. Rao. “Free Vibration Analysis of Functionally Graded Beams”. Defence Science Journal 62, no. 3 (July 6, 2012): 139-146. Accessed January 28, 2022. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/1326.