%0 Journal Article
%A T. Yu. Semenova
%T Approximation by step functions of functions belonging to Sobolev spaces

%J Izvestiya. Mathematics 
%D 2007
%P 149-180
%V 71
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2007_71_1_a7/
%G en
%F IM2_2007_71_1_a7