Zemlyanukhin, Aleksandr Isaevich, and Andrey Vladimirovich Bochkarev. “The Perturbation Method and Exact Solutions of Nonlinear Dynamics Equations for Media With Microstructure”. Computational Continuum Mechanics, vol. 9, no. 2, June 2016, pp. 182-91, https://doi.org/10.7242/1999-6691/2016.9.2.16.