%0 Journal Article %A M. G. Gasymov %T Spectral analysis of a class of second-order non-self-adjoint differential operators %J Funkcionalʹnyj analiz i ego priloženiâ %D 1980 %P 14-19 %V 14 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1980_14_1_a1/ %G ru %F FAA_1980_14_1_a1