%0 Journal Article %A B. D. Boyanov %T The optimal recovery of smooth functions %J Sbornik. Mathematics %D 1991 %P 357-377 %V 69 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1991_69_2_a2/ %G en %F SM_1991_69_2_a2