Serdoun, N. S. M., and S. M. Hamza-Cherif. “Free Vibration Analysis of Isotropic Plates by Alternative Hierarchical Finite Element Method Based on Reddy’s C1 HSDT”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 9, no. 1, July 2014, pp. 1-19, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/522.