“Free Vibration Analysis of Stiffened and Unstiffened Membranes”, Int. J. Emerg. Trends Sci. Technol., vol. 3, no. 04, pp. 3800–3805, Apr. 2016, Accessed: Sep. 28, 2026. [Online]. Available: http://igmpublication.com/ijetst.in/index.php/ijetst/article/view/1053