%0 Journal Article %A Carlos E. Kenig %A Tatiana Toro %T Free boundary regularity for harmonic measures and Poisson kernels %J Annals of mathematics %D 1999 %V 150 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM_1999_150_2_a0/ %F AM_1999_150_2_a0