TY  - JOUR
AU  - S. A. Kreis
TI  - Frames and periodic groups of operators
JO  - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics
PY  - 2012
SP  - 14
EP  - 18
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ISU_2012_12_2_a2/
LA  - ru
ID  - ISU_2012_12_2_a2
ER  -