%0 Journal Article %A N. S. Ustinov %T On the Constancy of the Extremal Function in the Embedding Theorem of Fractional Order %J Funkcionalʹnyj analiz i ego priloženiâ %D 2020 %P 85-97 %V 54 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_2020_54_4_a6/ %G ru %F FAA_2020_54_4_a6