TY  - JOUR
AU  - M.D. Takev
TI  - Direct and Inverse Approximation Theorems in R2
JO  - Mathematica balkanica
PY  - 2002
SP  - 53
VL  - 16
IS  - 1-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MABA_2002_16_1-4_a2/
ID  - MABA_2002_16_1-4_a2
ER  -