TY - JOUR AU - Ben Belgacem, Faker AU - Brenner, Susanne C. TI - Some nonstandard finite element estimates with applications to $3D$ Poisson and Signorini problems JO - Electronic transactions on numerical analysis PY - 2001 SP - 134 EP - 148 VL - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ETNA_2001__12__a5/ LA - en ID - ETNA_2001__12__a5 ER -