Geodesic
A mixed boundary value problem for some degenerate elliptic equations
Sbornik. Mathematics, Tome 27 (1975) no. 4, pp. 447-462 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this article we study problems concerning the eigenvalues $\lambda^{(k)}$ and the eigenfunctions $U^{(k)}(x)$ that are regular in the domain, for a formally selfadjoint degenerate equation with mixed boundary conditions; and on this basis we investigate the corresponding inhomogeneous boundary problems. Bibliography: 16 titles. 
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     title = {A~mixed boundary value problem for some degenerate elliptic equations},
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A. I. Achil'diev. A mixed boundary value problem for some degenerate elliptic equations. Sbornik. Mathematics, Tome 27 (1975) no. 4, pp. 447-462. http://geodesic.mathdoc.fr/item/SM_1975_27_4_a0/

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