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Communicated by J. Serrin
This research was supported in part by a grant from the National Science Foundation.
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Gariepy, R., Ziemer, W.P. A regularity condition at the boundary for solutions of quasilinear elliptic equations. Arch. Rational Mech. Anal. 67, 25–39 (1977). https://doi.org/10.1007/BF00280825
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DOI: https://doi.org/10.1007/BF00280825