MathSciNet bibliographic data MR990856 (90d:35306) 35R35 (35J05) Caffarelli, Luis A. A Harnack inequality approach to the regularity of free boundaries. I. Lipschitz free boundaries are $C\sp {1,\alpha}$$C\sp {1,\alpha}$. Rev. Mat. Iberoamericana 3 (1987), no. 2, 139–162. Article

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