Z. G. B. Muhammad Nawaz Naeem , Tran., “Vibration of three-layered cylindrical shell with functionally graded middle layer for various volume fraction laws”, int.jour.sci.res.mana, vol. 3, no. 3, Mar. 2015, Accessed: Jun. 29, 2025. [Online]. Available: https://ijsrm.net/index.php/ijsrm/article/view/500