%0 Journal Article
%A N. P. Korneichuk
%T On extremal problems in the theory of best approximation
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1974
%P 7-43
%V 29
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1974_29_3_a2/
%G en
%F RM_1974_29_3_a2