TY  - JOUR
AU  - F. B. Koval'chik
TI  - Certain analogues of the Hardy--Litlewood problem and density methods
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1981
SP  - 121
EP  - 142
VL  - 112
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a9/
LA  - ru
ID  - ZNSL_1981_112_a9
ER  -