Generic regularity of free boundaries for the obstacle problem

On the Measure and the Structure of the Free Boundary of the Lower Dimensional Obstacle Problem

(2018) Matteo Focardi et al.   ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS

A logarithmic epiperimetric inequality for the obstacle problem

(2018) Maria Colombo et al.   GEOMETRIC AND FUNCTIONAL ANALYSIS

On the fine structure of the free boundary for the classical obstacle problem

(2018) Alessio Figalli et al.   INVENTIONES MATHEMATICAE

Optimal Regularity for the No-Sign Obstacle Problem

(2012) John Andersson et al.   COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS

Extension of $C^{m, \omega}$-Smooth Functions by Linear Operators

(2011) Charles Fefferman   REVISTA MATEMATICA IBEROAMERICANA

Some new monotonicity formulas and the singular set in the lower dimensional obstacle problem

(2009) Nicola Garofalo et al.   INVENTIONES MATHEMATICAE