Geodesic
On the vibration of nonhomogeneous string
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1990), pp. 41-44.

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In the paper an equation Is obtained to define the vibration frequency of the nonhomogeneous string, when the density of the string’s material changes by the given rule. 
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S. V. Sarkissian. On the vibration of nonhomogeneous string. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (1990), pp. 41-44. http://geodesic.mathdoc.fr/item/UZERU_1990_3_a6/

[1] Yu. N. Rabotnov, Mekhanika deformiruemogo tverdogo tela, Nauka, M., 1979, 744 pp. | Zbl

[2] V. S. Sarkisyan, Nekotorye zadachi matematicheskoi teorii uprugosti anizotropnogo tela, Izd-vo Erevan. un-ta, Erevan, 1976 | MR

[3] R. Kristensen, Vvedenie v mekhaniku kompozitov, Mir, M., 1982