Доступные ссылки:

Harvard: Назаров, В. Е., Кияшко, С. Б.& Radostin, A. V. 2016. The wave processes in micro-inhomogeneous media with different-modulus nonlinearity and relaxation. Radiophysics and Quantum Electronics, 59(3), pp. 246-256, doi: 10.1007/s11141-016-9693-7