%0 Journal Article
%A M.-B. Babayev
%T Extremal properties and two-sided estimates in approximation by sums of functions of lesser number of variables
%J Matematičeskie zametki
%D 1984
%P 647-659
%V 36
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1984_36_5_a2/
%G ru
%F MZM_1984_36_5_a2