%0 Journal Article %A I. M. Petrushko %T Existence of boundary values for solutions of degenerate elliptic equations %J Sbornik. Mathematics %D 1999 %P 973-1004 %V 190 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1999_190_7_a2/ %G en %F SM_1999_190_7_a2