@article{01419955,
title = {Free boundary regularity for harmonic measures and Poisson kernels.},
journal = {Annals of Mathematics. Second Series},
volume = {150},
year = {1999},
pages = {369-454},
doi = {10.2307/121086},
zbl = {0946.31001},
language = {en},
url = {http://dml.mathdoc.fr/item/01419955}
}
Kenig, Carlos E.; Toro, Tatiana. Free boundary regularity for harmonic measures and Poisson kernels.. Annals of Mathematics. Second Series, Tome 150 (1999) pp. 369-454. doi : 10.2307/121086. http://gdmltest.u-ga.fr/item/01419955/