VIBRATION ANALYSIS OF THREE-LAYERED FUNCTIONALLY GRADED CYLINDRICAL SHELLS WITH ISOTROPIC MIDDLE LAYER RESTING ON WINKLER AND PASTERNAK FOUNDATIONS. PJS [Internet]. 2022 Dec. 28 [cited 2026 Feb. 17];65(2). Available from: https://paas-pk.org/index.php/pjs/article/view/704