%0 Journal Article %A Ovidiu Savin %T Regularity of flat level sets in phase transitions %J Annals of mathematics %D 2009 %P 41-78 %V 169 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4007/annals.2009.169.41/ %R 10.4007/annals.2009.169.41 %G en %F 10_4007_annals_2009_169_41