%0 Journal Article %A R. F. Shamoyan %T On some extremal problems in certain harmonic function spaces of several variables related to mixed norm spaces %J Problemy analiza %D 2013 %P 43-58 %V 2 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PA_2013_2_1_a3/ %G en %F PA_2013_2_1_a3