%0 Journal Article %A L. A. Sakhnovich %T Nonunitary operators with absolutely continuous spectrum %J Izvestiya. Mathematics %D 1969 %P 51-63 %V 3 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a4/ %G en %F IM2_1969_3_1_a4