TY  - JOUR
AU  - O. Widlund
TI  - On Best Error Bounds for Approximation by Piecewise Polynomial Functions.
JO  - Numerische Mathematik
PY  - 1976
SP  - 327
EP  - 338
VL  - 27
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/NUMA_1976__27_132456/
ID  - NUMA_1976__27_132456
ER  -