%0 Journal Article
%A V. L. Levin
%T Application of E.~Helly's theorem to convex programming, problems of best approximation and related questions
%J Sbornik. Mathematics
%D 1969
%P 235-247
%V 8
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1969_8_2_a5/
%G en
%F SM_1969_8_2_a5