TY - JOUR AU - Ovidiu Savin TI - Regularity of flat level sets in phase transitions JO - Annals of mathematics PY - 2009 SP - 41 EP - 78 VL - 169 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4007/annals.2009.169.41/ DO - 10.4007/annals.2009.169.41 LA - en ID - 10_4007_annals_2009_169_41 ER -