%0 Journal Article
%A S. A. Kreis
%T Frames and periodic groups of operators
%J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics
%D 2012
%P 14-18
%V 12
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ISU_2012_12_2_a2/
%G ru
%F ISU_2012_12_2_a2