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- [1] ASYMPTOTIC-BEHAVIOR OF EIGENVALUES AT WEAKLY PERTURBED NORMAL OPERATORS DOKLADY AKADEMII NAUK SSSR, 1989, 307 (04): : 802 - 806
- [2] EIGENVALUES OF WEAKLY SINGULAR INTEGRAL-OPERATORS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1990, 41 : 323 - 335
- [5] ON EIGENVALUES OF PERTURBED OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 16 (03): : 567 - &
- [8] ASYMPTOTIC BEHAVIOUR OF EIGENVALUES AND EIGENFUNCTIONS OF 1-DIMENSIONAL SINGULAR DIFFERENTIAL OPERATORS DOKLADY AKADEMII NAUK SSSR, 1966, 169 (02): : 288 - &
- [10] DISTRIBUTION OF EIGENVALUES OF SINGULAR DIFFERENTIAL OPERATORS DOPOVIDI AKADEMII NAUK UKRAINSKOI RSR SERIYA A-FIZIKO-MATEMATICHNI TA TECHNICHNI NAUKI, 1970, (05): : 416 - &