%0 Journal Article %A Yu. A. Lysenko %A B. M. Pisarevskii %T Instability of harmonic capacity and approximations of continuous functions by harmonic functions %J Sbornik. Mathematics %D 1968 %P 53-72 %V 5 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1968_5_1_a3/ %G en %F SM_1968_5_1_a3