%0 Journal Article %A S. V. Gaidenko %T On exceptional sets on the boundary and the uniqueness of solutions of the Dirichlet problem for a~second order elliptic equation %J Sbornik. Mathematics %D 1981 %P 107-123 %V 39 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1981_39_1_a4/ %G en %F SM_1981_39_1_a4