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On a spectral problem for a system of partial differential equations
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2005), pp. 40-46 Cet article a éte moissonné depuis la source Math-Net.Ru

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The accounting of the eigenvalues and the completeness of the eigenfunctions has been proved for a boundary problem with partial derivatives. 
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T. N. Harutyunyan; G. H. Sahakyan. On a spectral problem for a system of partial differential equations. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2005), pp. 40-46. http://geodesic.mathdoc.fr/item/UZERU_2005_3_a1/

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[2] G. G. Saakyan, “Teorema Floke-Lyapunova dlya dvukhparametricheskoi sistemy Diraka s periodicheskimi koeffitsientami”, Uchenye zapiski EGU, 2001, no. 2, 14–21

[3] G. G. Saakyan, “O polnote sobstvennykh funktsii dvukhparametricheskoi kraevoi zadachi Diraka”, Uchenye zapiski EGU, 2002, no. 1, 9–13