MathSciNet bibliographic data MR1752439 (2001f:35448) 35R35 (35J60) Wang, Pei-Yong Regularity of free boundaries of two-phase problems for fully nonlinear elliptic equations of second order. I. Lipschitz free boundaries are $C\sp {1,\alpha}$$C\sp {1,\alpha}$. Comm. Pure Appl. Math. 53 (2000), no. 7, 799–810. Article

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