Molla-Alipour, M, Shariyat, M, Shaban, M (2020) ‘Free Vibration Analysis of Bidirectional Functionally Graded Conical/Cylindrical Shells and Annular Plates on Nonlinear Elastic Foundations, Based on a Unified Differential Transform Analytical Formulation’, Journal of Solid Mechanics, 12(2), pp. 385-400. doi:10.22034/jsm.2019.1869981.1450