TY  - JOUR
AU  - P. V. Paramonov
TI  - On~approximation by harmonic polynomials in the $C^1$-norm on compact sets in~$\mathbf R^2$
JO  - Izvestiya. Mathematics 
PY  - 1994
SP  - 321
EP  - 331
VL  - 42
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1994_42_2_a3/
LA  - en
ID  - IM2_1994_42_2_a3
ER  -