@Misc{ FigKruRos17, author = { Figalli, Alessio and Krummel, Brian and Ros-Oton, Xavier }, title = { On the regularity of the free boundary in the p-Laplacian obstacle problem }, journal = { J. Differential Equations }, year = { 2017 }, pages = { }, URL = { http://cvgmt.sns.it/paper/3375/ }, note = { cvgmt preprint} }