%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 %U http://geodesic.mathdoc.fr/articles/10.2307/121086/ %R 10.2307/121086 %F 10_2307_121086