%0 Journal Article %A V. I. Filippenko %T On one class of non-selfadjoint differential operators with a discrete spectrum %J Differencialʹnye uravneniâ %D 1978 %P 383-384 %V 14 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1978_14_2_a26/ %G ru %F DE_1978_14_2_a26