%0 Journal Article %A G. Di Fazio %T Dirichlet problem. Characterization of regularity. %J Manuscripta mathematica %D 1994 %P 47-56 %V 84 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1994__84_1_155977/ %F MM2_1994__84_1_155977