%0 Journal Article
%A O. A. Timoshin
%T Order of the best approximation of partial differential operators
%J Matematičeskie zametki
%D 1990
%P 115-121
%V 48
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1990_48_4_a12/
%G ru
%F MZM_1990_48_4_a12