TY - JOUR AU - Clément, Ph. TI - Approximation by finite element functions using local regularization JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 1975 SP - 77 EP - 84 VL - 9 IS - R2 PB - Dunod PP - Paris UR - http://geodesic.mathdoc.fr/item/M2AN_1975__9_2_77_0/ LA - en ID - M2AN_1975__9_2_77_0 ER -