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- [5] ON SPECTRUM OF NORMAL OPERATORS + THEIR PERTURBATIONS DOKLADY AKADEMII NAUK SSSR, 1964, 158 (05): : 1042 - &
- [9] Persistence of Point Spectrum for Perturbations of One-Dimensional Operators with Discrete Spectra SPECTRAL THEORY AND MATHEMATICAL PHYSICS, STMP 2018, 2020, : 125 - 151
- [10] SPECTRAL ANALYSIS ON UNITARY SPECTRUM - POINT SPECTRUM DOKLADY AKADEMII NAUK SSSR, 1971, 199 (03): : 544 - &