On Coefficients of Eigenfunction Expansions for Boundary-Value Problems with Parameter in Boundary Conditions
Matematičeskie zametki, Tome 75 (2004) no. 4, pp. 493-506.

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In this paper, we consider boundary-value problems for an $n$th-order ordinary differential equation with polynomials of the spectral parameter in the equation and in the boundary conditions. For a wide class of such problems, we find coefficients of the eigen and associated function expansions for the Shkalikov linearizer.
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A. M. Akhtyamov. On Coefficients of Eigenfunction Expansions for Boundary-Value Problems with Parameter in Boundary Conditions. Matematičeskie zametki, Tome 75 (2004) no. 4, pp. 493-506. http://geodesic.mathdoc.fr/item/MZM_2004_75_4_a1/

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