%0 Journal Article %A Brenner, Susanne C. %T Discrete Sobolev and Poincaré inequalities for piecewise polynomial functions %J Electronic transactions on numerical analysis %D 2004 %P 42-48 %V 18 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2004__18__a11/ %G en %F ETNA_2004__18__a11