Geodesic
A~mixed boundary value problem for some degenerate elliptic equations
Sbornik. Mathematics, Tome 27 (1975) no. 4, pp. 447-462

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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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     author = {A. I. Achil'diev},
     title = {A~mixed boundary value problem for some degenerate elliptic equations},
     journal = {Sbornik. Mathematics},
     pages = {447--462},
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     volume = {27},
     number = {4},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_27_4_a0/}
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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/