共 19 条
[1]
Akopyan G.S., On completeness of system of eigenvectors-polynomials of a linear pencil of differential operators on ellipsoidal domais, Dokl. Akad. Nauk ArmSSR, 86, 4, pp. 147-152, (1988)
[2]
Aleksandryan R.A., On Dirichlet problem for string equation and completeness of a certain function system in a disk, Dokl. Akad. Nauk SSSR, 73, 5, (1950)
[3]
Aleksandryan R.A., Spectral properties of operators generated by system of Sobolev-type differential equations, Tr. Mosk. Mat. Obshch., 9, pp. 455-505, (1960)
[4]
Arnol'd V.I., Small denominators, Izv. Akad. Nauk SSSR, Ser. Mat., 25, 1, pp. 21-86, (1961)
[5]
Berezanskii Y.M., Expansions in Eigenfunctions of Self-Adjoint Operators, (1965)
[6]
Berger M., Géométrie, (1978)
[7]
Bourgin D., Duffin R., The Dirlchlet problem for the vibrating string equations, Bull. Am. Math. Soc., 45, pp. 851-858, (1939)
[8]
Burskii V.P., Methods for Studying Boundary-Value Problems for General Differential Equations, (2002)
[9]
Burskii V.P., Zhdanov A.S., Boundary-value problems for vibrating string equation, Poncelet problem, and Pell-Abel equation connections and relations, Contemporary Mathematics, Fundamental Directions, 15, pp. 5-9, (2006)
[10]
Fokin M.V., On singular spectrum in S. L. Sobolev problem, Mathematical Analysis and Differential Equations, pp. 11-15, (1992)