TY - JOUR AU - Verfürth, R. TI - A posteriori error estimates for nonlinear problems. $L^r$-estimates for finite element discretizations of elliptic equations JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 1998 SP - 817 EP - 842 VL - 32 IS - 7 PB - Elsevier UR - http://geodesic.mathdoc.fr/item/M2AN_1998__32_7_817_0/ LA - en ID - M2AN_1998__32_7_817_0 ER -