Boundary regularity for free boundary problems

The Green function for uniformly elliptic equations

Michael Gr�ter, Kjell‐Ove Widman · manuscripta mathematica · 1982 · 474 citations

Natural Sciences, Computational Engineering, Differential Equations +9

A Harnack Inequality Approach to the Regularity of Free Boundaries. Part I: Lipschitz Free Boundaries are $C^{1, \alpha}$

Luis Caffarelli · Revista Matemática Iberoamericana · 1987 · 257 citations · Full text

Natural Sciences, Mathematics, Dynamical Systems +9

Gradient estimates for variable coefficient parabolic equations and singular perturbation problems

Luis Caffarelli, Carlos E. Kenig · American Journal of Mathematics · 1998 · 81 citations

Natural Sciences, Computational Engineering, Differential Equations +14