Lipschitz Interior regularity for the viscosity and weak solutions of   the pseudo-$p$Laplacian
  We prove interior Lipschitz regularity result for weak and viscosity solutions of the pseudo $p$Laplacien $(p-1)\sum_i |\partial_i u|^{p-2} \partial_{ii} u = f$ for $p>2$ and $f$ bounded. 
Francoise Demengel
math.AP