%0 Journal Article %A V. A. Mikhailets %A V. M. Molyboga %T On the Spectrum of Singular Perturbations of Operators on the Circle %J Matematičeskie zametki %D 2012 %P 629-632 %V 91 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2012_91_4_a16/ %G ru %F MZM_2012_91_4_a16