TY - JOUR AU - J. Douglas, Jr. AU - Milner, F. A. TI - Interior and superconvergence estimates for mixed methods for second order elliptic problems JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 1985 SP - 397 EP - 428 VL - 19 IS - 3 PB - AFCET - Gauthier-Villars PP - Paris UR - http://geodesic.mathdoc.fr/item/M2AN_1985__19_3_397_0/ LA - en ID - M2AN_1985__19_3_397_0 ER -