%0 Journal Article %A S. G. Krein %T On interpolation theorem in operator theory %J Doklady Akademii Nauk %D 1960 %P 491-494 %V 130 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1960_130_3_a1/ %G ru %F DAN_1960_130_3_a1