List of Articles Non-uniform elastic foundation Open Access Article Abstract Page Full-Text 1 - 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 M Molla-Alipour M Shariyat M Shaban 10.22034/jsm.2019.1869981.1450 20.1001.1.20083505.2020.12.2.10.8