%0 Journal Article %A Verfürth, Rüdiger %T A note on polynomial approximation in Sobolev spaces %J ESAIM: Mathematical Modelling and Numerical Analysis %D 1999 %P 715-719 %V 33 %N 4 %I EDP-Sciences %U http://geodesic.mathdoc.fr/item/M2AN_1999__33_4_715_0/ %G en %F M2AN_1999__33_4_715_0