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3. G. Kol’sky, Stress Waves in Elastic Bodies (Inostr. Liter., Moscow, 1955) [in Russian].
4. D. Achenbach, J. Acoust. Soc. Am. 103, 2283 (1998).
5. E. Dieulesaint and D. Royer, Elastic Waves in Solids (Wiley, New York, 1980).