%0 Journal Article
%A Helfrich, Hans-Peter
%T Simultaneous approximation in negative norms of arbitrary order
%J ESAIM: Mathematical Modelling and Numerical Analysis 
%D 1981
%P 231-235
%V 15
%N 3
%I Centrale des revues, Dunod-Gauthier-Villars
%C Montreuil
%U https://geodesic-test.mathdoc.fr/item/M2AN_1981__15_3_231_0/
%G en
%F M2AN_1981__15_3_231_0