فهرس المقالات Bidirectional functionally graded حرية الوصول المقاله صفحة الملخص نص كامل 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