%0 Journal Article
%A V. A. Klyachin
%T Approximation of the gradient of a~function on the basis of a~special

%J Izvestiya. Mathematics 
%D 2018
%P 1136-1147
%V 82
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2018_82_6_a2/
%G en
%F IM2_2018_82_6_a2