Free boundary regularity for fully nonlinear non-homogeneous two-phase problems
arXiv:1304.0406
Abstract
We prove that flat or Lipschitz free boundaries of two-phase free boundary problems governed by fully nonlinear uniformly elliptic operators and with non-zero right hand side are $C^{1,γ}$.
Updated references. arXiv admin note: substantial text overlap with arXiv:1210.7226