TY  - JOUR
AU  - M. Sh. Birman
AU  - M. Z. Solomyak
TI  - Piecewise-polynomial approximations of functions of the classes $W_p^\alpha$
JO  - Sbornik. Mathematics
PY  - 1967
SP  - 295
EP  - 317
VL  - 2
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1967_2_3_a2/
LA  - en
ID  - SM_1967_2_3_a2
ER  -