Cuong, Nguyen Manh, et al. “Free Vibration of Thick Composite Plates on Non-Homogeneous Elastic Foundations by Dynamic Stiffness Method”. <i>Vietnam Journal of Mechanics</i>, vol. 35, no. 4, Nov. 2013, pp. 257-74, doi:10.15625/0866-7136/35/4/2818.