Geodesic
Propagation of a harmonic wave in a plate with symmetric structure
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2011), pp. 45-49

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In this paper a three-layer plate with symmetrical structure to solve the problem of determining the properties of the middle layer, which can propagate the harmonic wave in three-layer plate with phase speed equal to the phase speed of a single-layer plate.
Keywords: sandwich plate, wave, phase speed. 
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A. V. Melkonyan; S. V. Sarkisyan. Propagation of a harmonic wave in a plate with symmetric structure. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2011), pp. 45-49. http://geodesic.mathdoc.fr/item/UZERU_2011_2_a7/