Self-adjoint polynomial operator pencils, spectrally equivalent to self-adjoint operators

1985 ◽  
Vol 36 (5) ◽  
pp. 498-500
Author(s):  
B. M. Podlevskii
1992 ◽  
Vol 25 (4) ◽  
pp. 306-308 ◽  
Author(s):  
K. Kh. Boimatov ◽  
A. G. Kostyuchenko

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