TY - JOUR AU - E. Fabes AU - N. Garofalo AU - S. Salsa TI - A control on the set where a Green's function vanishes JO - Colloquium Mathematicum PY - 1990 SP - 637 EP - 647 VL - 60 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-60-61-2-637-647/ DO - 10.4064/cm-60-61-2-637-647 LA - en ID - 10_4064_cm_60_61_2_637_647 ER -