@Article{ farval10, author = { Farina, Alberto and Valdinoci, Enrico }, title = { Flattening Results for Elliptic PDEs in Unbounded Domains with Applications to Overdetermined Problems }, journal = { Arch. Rational Mech. Anal. }, year = { 2010 }, volume = { 195 }, number = { 3 }, pages = { 1025-1058 }, URL = { http://cvgmt.sns.it/paper/1157/ }, note = { cvgmt preprint} }