M. Focardi, F. Geraci, E. Spadaro:
The classical obstacle problem for nonlinear variational energies
(Nonlinear Analysis TMA) 2016

F. Geraci:
The Classical Obstacle problem with coefficients in fractional Sobolev spaces
Annali di Matematica Pura ed Applicata (Accepted Paper) 2017

F. Geraci:
An epiperimetric inequality for the lower dimensional obstacle problem
(Preprint) 2017

M. Focardi, F. Geraci, E. Spadaro:
Quasi-monotonicity formulas for classical obstacle problems with Sobolev coefficients and applications
JOTA 2018