%0 Journal Article
%A V. N. Polyakov
%T A~multiplication theorem for the characteristic functions of linear operators
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1973
%P 73-76
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1973_5_a9/
%G ru
%F IVM_1973_5_a9