%0 Journal Article
%A Kh. P. Rustamov
%T On direct and inverse theorems for the best $L_p$-approximation on a sphere
%J Doklady Akademii Nauk
%D 1987
%P 788-791
%V 294
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_294_4_a3/
%G ru
%F DAN_1987_294_4_a3