%0 Journal Article %A I. Ts. Gokhberg %A M. G. Krein %T Multiplicative representation of the characteristic functions of operators close to unitary %J Doklady Akademii Nauk %D 1965 %P 732-735 %V 164 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1965_164_4_a2/ %G ru %F DAN_1965_164_4_a2