Optimal C^{1,α} boundary regularity holds for viscosity solutions to fully nonlinear elliptic equations with double phase degeneracy under oblique boundary conditions, with an improved result at vanishing points of the source term.
Ishii, Fully nonlinear oblique derivative problems for nonlinear second-order elliptic PDE’s, Duke Math
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Optimal $C^{1,\alpha}$ regularity up to the boundary for fully nonlinear elliptic equations with double phase degeneracy
Optimal C^{1,α} boundary regularity holds for viscosity solutions to fully nonlinear elliptic equations with double phase degeneracy under oblique boundary conditions, with an improved result at vanishing points of the source term.