%0 Journal Article %A P. L. Krupkin %T On the spectrum of a pencil of compact operators %J Differencialʹnye uravneniâ %D 1991 %P 1829-1830 %V 27 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1991_27_10_a26/ %G ru %F DE_1991_27_10_a26