%0 Journal Article
%A P. L. Ul'yanov
%T Imbedding theorems and best approximations
%J Doklady Akademii Nauk
%D 1969
%P 1044-1047
%V 184
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_184_5_a6/
%G ru
%F DAN_1969_184_5_a6