@Article{ LemMilSpi12, author = { Lemenant, Antoine and Milakis, Emmanouil and Spinolo, Laura Valentina }, title = { On the extension property of Reifenberg-flat domains }, journal = { Annales Academiae Scientiarum Fennicae Mathematica }, year = { 2012 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1908/ }, note = { cvgmt preprint} }