Vronskii B. M.
Ukr. Mat. Zh. - 2006. - 58, № 12. - pp. 1614–1623
We study the structure of the spectrum and the completeness and basis property of a system of eigenvectors.
Ukr. Mat. Zh. - 2006. - 58, № 10. - pp. 1326–1334
We study small motions and free oscillations of a compressible stratified liquid, the structure of the spectrum, and the basis property of a system of eigenvectors and obtain asymptotic relations for eigenvalues.