%0 Journal Article %A Yu. A. Tikhonov %T On the spectrum localization of an operator-function arising at studying oscillations of a viscoelastic pipeline with Kelvin--Voigt friction %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2022 %P 23-34 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2022_2_a2/ %G ru %F VMUMM_2022_2_a2