%0 Journal Article %A Ben Belgacem, Faker %A Brenner, Susanne C. %T Some nonstandard finite element estimates with applications to $3D$ Poisson and Signorini problems %J Electronic transactions on numerical analysis %D 2001 %P 134-148 %V 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2001__12__a5/ %G en %F ETNA_2001__12__a5