Vinh, P. C., T. T. Tuan, and L. T. Hue. “Approximate Formula for the H/V Ratio of Rayleigh Waves in Incompressible Orthotropic Half-Spaces Coated by a Thin Elastic Layer”. *Vietnam Journal of Mechanics*, vol. 39, no. 4, Dec. 2017, pp. 365-74, doi:10.15625/0866-7136/10033.