Cuong, N.M., Thinh, T.I., Hien, T.T. and Ninh, D.G. 2013. Free vibration of thick composite plates on non-homogeneous elastic foundations by dynamic stiffness method. Vietnam Journal of Mechanics. 35, 4 (Nov. 2013), 257–274. DOI:https://doi.org/10.15625/0866-7136/35/4/2818.