%0 Journal Article %A V. I. Frolov %T Estimate for the spectrum of an operator bundle and its application to stability problems %J Matematičeskie zametki %D 1976 %P 611-614 %V 19 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1976_19_4_a14/ %G ru %F MZM_1976_19_4_a14