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2. Kulikovskii A.G., Sveshnikova Elena I. Nonlinear Waves in Elastic Media. Boca Raton. CRC Press, 1995.
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4. Rabotnov Yu.N. Elements of Hereditary Mechanics of Solids. Moscow: Nauka, 1977. (in Russian)
5. Ovsyannikov L.V. Group analysis of differential equations. Moscow: Nauka, 1978. (in Russian)