%0 Journal Article
%A I. I. Ibragimov
%A M.-B. A. Babayev
%T On estimates of best approximations of a function of several variables by sums of two functions of a smaller number of variables
%J Doklady Akademii Nauk
%D 1971
%P 1037-1040
%V 201
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_201_5_a6/
%G ru
%F DAN_1971_201_5_a6