%0 Journal Article %A V. V. Kornienko %T The spectrum of irregular operators %J Differencialʹnye uravneniâ %D 1985 %P 65-77 %V 21 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1985_21_1_a9/ %G ru %F DE_1985_21_1_a9