%0 Journal Article %A Allan M. Krall %T On non-self-adjoint ordinary differential operators of the second order %J Doklady Akademii Nauk %D 1965 %P 1235-1237 %V 165 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1965_165_6_a3/ %G ru %F DAN_1965_165_6_a3