%0 Journal Article
%A N. A. Il'yasov
%T An inverse theorem of approximation theory of periodic functions in various metrics
%J Matematičeskie zametki
%D 1992
%P 53-61
%V 52
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1992_52_2_a5/
%G ru
%F MZM_1992_52_2_a5