%0 Journal Article %A Kh. Kh. Burchaev %A G. Yu. Ryabykh %T Properties of extremal elements in the duality relation for Hardy spaces %J Vladikavkazskij matematičeskij žurnal %D 2018 %P 5-19 %V 20 %N 4 %U http://geodesic.mathdoc.fr/item/VMJ_2018_20_4_a0/ %G ru %F VMJ_2018_20_4_a0