%0 Journal Article %A B. P. Allakhverdiev %T On the theory of nonselfadjoint operators of Schrödinger type with a matrix potential %J Izvestiya. Mathematics %D 1993 %P 193-205 %V 41 %N 2 %U http://geodesic.mathdoc.fr/item/IM2_1993_41_2_a1/ %G en %F IM2_1993_41_2_a1