%0 Journal Article %A V. E. Khartovskii %T On some problems of controllability and observability for differential-algebraic systems with aftereffect %J Trudy Instituta matematiki %D 2021 %P 126-137 %V 29 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMB_2021_29_1_a11/ %G ru %F TIMB_2021_29_1_a11