Sadovskii, V., and E. Chentsov. “Analysis of Resonant Excitation of Layered and Block Media on the Basis of Discrete Models”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 16, no. 44, June 2015, pp. 318-27, doi:10.26089/NumMet.v16r231.