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JOURNALS // Izvestiya Rossiiskoi Akademii Nauk. Seriya Matematicheskaya // Archive
Izv. Akad. Nauk SSSR Ser. Mat., 1964 Volume 28, Issue 1, Pages 79–90 (Mi im3065)
On the invariance of the spectrum of small perturbations of the polyharmonic operator

R. M. Martirosyan


Received: 17.04.1963



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