2. Regularity of a free boundary for viscosity solutions of nonlinear elliptic equations
(Communications on Pure and Applied Mathematics, Vol LIV,42-56(2001))
3. Free-Boundary Regularity on the Focusing Problem for the Gauss Curvature Flow with Flat Sides
( to appear in Math Z.)

4. All time $C^\infty$-Regulatity of interface in degenerated diffusion: a geometric approach
(Duke Mathematical Journal Vol 108, No.2, 295-327, 2001 )

5. Obstacle Problem for Nonlinear $2^{nd}$-Order Elliptic Operator
(Ph-Thesis, New York University, 1998)

6. Worn Stones with Flat Sides The Regularity of the Interface
(in writing)

7. Hausdorff dimension and stability for the p-Obstacle problem (2< p < \infty)
(preprint)

8. All time existence of a smooth solution for the one-phase free boundary problem of the flame type
(preprint)

9. Geometrical properties of solutions of the Porous Medium Equation for large times
(preprint)

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