TY  - JOUR
AU  - S. G. Merzlyakov
TI  - Conditions for the range of a~difference operator to be closed
JO  - Izvestiya. Mathematics 
PY  - 1997
SP  - 593
EP  - 618
VL  - 61
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1997_61_3_a4/
LA  - en
ID  - IM2_1997_61_3_a4
ER  -