Geodesic
On a~class of nonlinear problems on characteristic values
Matematičeskie zametki, Tome 15 (1974) no. 6, pp. 907-913.

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For a class of problems on characteristic values where the spectral parameter enters in a polynomial form we establish the fact that proximity of the operator-coefficients of the corresponding operator-functions implies proximity of the n-th characteristic values. 
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     author = {Yu. Sh. Abramov},
     title = {On a~class of nonlinear problems on characteristic values},
     journal = {Matemati\v{c}eskie zametki},
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     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_6_a9/}
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Yu. Sh. Abramov. On a~class of nonlinear problems on characteristic values. Matematičeskie zametki, Tome 15 (1974) no. 6, pp. 907-913. http://geodesic.mathdoc.fr/item/MZM_1974_15_6_a9/